Use the A-Z list to browse more than 6,000 health-related topics in our library. Clicking on a term opens the definition and, in most cases, links to more information.
Dietary fibers that contain galactose, mannose and other monosaccharides and that form into a gel. They are found in seaweed. More Information on Mucilages: Carbs & Sugars
A cancerous (malignant) tumor that begins within the mucus membranes that line of body cavities and organs. More Information on Mucinous Carcinoma: Cancer Basics
A term that describes two basic forms of benign salivary gland disorders. The first occurs upon severing the tube that carries saliva from a gland to the mouth. The second involves blockage of a duct that carries saliva to the mouth. More Information on Mucocele: Mouth & Tongue Disorders
A disorder of the immune system characterized by yeast infections of the mucous membranes, scalp, skin and nails. More Information on Mucocutaneous Candidiasis: Skin Related Infections
"Mucocutaneous Lymph Node Syndrome" is more commonly referred to as "Kawasaki Disease" in the medical community. Kawasaki Disease
Also Known As: "Kawasaki Syndrome"
An acquired condition, primarily affecting young children. It is characterized by fever, rash, swollen feet and lymph nodes, and mucus in the lips and mouth. It may also affect the linings of the blood vessels and heart muscle. More Information on Kawasaki Disease: Pediatric Heart
A group of four inherited metabolic diseases that cause abnormal amounts of carbohydrates or fatty materials (lipids) to accumulate in cells. Symptoms include mental and physical disabilities. There is no cure. More Information on Mucolipidoses: Birth & Genetic Disorders
A group of inherited diseases in which an abnormal enzyme causes large amounts of complex sugar molecules to accumulate in the body's cells and tissues. This can cause cell damage that leads to physical and mental disabilities. More Information on Mucopolysaccharidoses: Birth & Genetic Disorders
"Mucosa Associated Lymphoid Tissue Lymphoma" is more commonly referred to as "MALT Lymphoma" in the medical community. MALT Lymphoma
A type of non-Hodgkin's lymphoma that occurs within cells of the mucosal tissue that are involved in the production of antibodies. More Information on MALT Lymphoma: Lymphoma (Hodgkin's & Non)
Medications that coat the lining of the digestive system. They are used to treat diarrhea, heartburn, indigestion and nausea. They may also be part of the treatment for some ulcers. Some are available over-the-counter. More Information on Mucosal Protective Drugs: Digestive Medications
"Mucous Colitis" is more commonly referred to as "Irritable Bowel Syndrome" in the medical community. Irritable Bowel Syndrome
Also Known As: "Spastic Colon, IBS, Spastic Bowel"
A recurrent disorder characterized by overactive nerves in the gastrointestinal tract, resulting in sensitivity to food, stool, gas and stress. Symptoms include abdominal pain, bloating, constipation and/or diarrhea. More Information on Irritable Bowel Syndrome: IBS & Bowel Function
Mucus-secreting group of cells located in the surface layer of the mucous membrane. The secretion of mucus is effective at preventing pathogens from entering the body. More Information on Mucous Glands: Nose & Throat
A substance secreted by tissues in the body and made up of water, mucin (a glycoprotein), salts, and some cells. In the lungs, mucus lubricates the insides of the airways and traps inhaled particles, but excess mucus may block airways.
Also Known As: "First Pass Scan, Radionuclide Ventriculography, Gated Blood Pool Scan, Nuclear Ventriculography, Multi Gated Acquisition Scan, Cardiac Blood Pooling Imaging"
A type of radionuclide imaging that is called "multi-gated" because the gamma camera takes multiple (sometimes over 60) different pictures, timed according to an EKG. It reveals blood flow and the function of the ventricles. More Information on MUGA Scan: Heart Imaging & Rhythm Tests
A condition marked by slow or halted growth that includes abnormalities of the muscles, brain, eyes and liver. It also includes restrictive pericarditis (inflammation of the membrane around the heart), heart failure and other heart-related problems. More Information on Mulibrey Dwarfism: Heart Injuries & Infections
A condition marked by slow or halted growth that includes abnormalities of the muscles, brain, eyes and liver. It also includes restrictive pericarditis (inflammation of the membrane around the heart), heart failure and other heart-related problems. More Information on Mulibrey Nanism Syndrome: Heart Injuries & Infections
Also Known As: "First Pass Scan, Radionuclide Ventriculography, Gated Blood Pool Scan, Nuclear Ventriculography, Cardiac Blood Pooling Imaging"
A type of radionuclide imaging that is called "multi-gated" because the gamma camera takes multiple (sometimes over 60) different pictures, timed according to an EKG. It reveals blood flow and the function of the ventricles. More Information on Multi Gated Acquisition Scan: Heart Imaging & Rhythm Tests
Dementia caused by blood clots that block small blood vessels in the brain, destroying brain tissue. It is a common source of dementia in the elderly. People with high blood pressure are at greater risk. Treatment focuses on stopping new damage. More Information on Multi Infarct Dementia: Alzheimer's & Dementia
Degenerative disorders affecting the central and autonomic nervous systems. The three types are: olivopontocerebellar atrophy (movement and speech), striatonigral degeneration (Parkinsonism) and MSA with orthostatic hypotension (combination type). More Information on Multi System Atrophy: Brain & Nerve Basics
Abnormal electrical impulses originating from more than one place in the heart's upper chambers (atria) and lead to an abnormally fast heartbeat. It is more common in older people and may be linked with COPD, heart failure or other chronic disorders. More Information on Multifocal Atrial Tachycardia: Arrhythmia
A type of dystonia (sustained muscle contractions leading to twisting movements and abnormal posture) that affects two or more unrelated areas of the body. More Information on Multifocal Dystonia: Movement Disorders
A progressive muscle disorder marked by muscle weakness in the hands, with differences from one side of the body to the other in the specific muscles involved. Treatment may be effective in preventing disability. More Information on Multifocal Motor Neuropathy: Neuropathy
Pregnancy in which a woman is carrying two or more babies. This increases the risk to mother and infants and requires additional monitoring and preparation. In recent decades the number of multiple births in the United States has soared. More Information on Multiple Birth: Pregnancy Basics
Conditions where multiple problems present at birth lead to mental impairment. These problems usually affect several body systems and are a frequent cause of mental retardation. More Information on Multiple Congenital Anomaly/Mental Retardation Syndromes: Pediatric Brain & Nerve
Also Known As: "Wermer's Syndrome, Multiple Endocrine Neoplasia Type 1 Syndrome, MEN1 Syndrome"
A rare and inherited disorder that lead to tumors in the endocrine system, including the pituitary gland, pancreas and parathyroid gland. While usually benign (non-cancerous), tumors in the pancreas can become cancerous. More Information on Multiple Endocrine Adenomatosis: Endocrine System Cancer
An inherited disorder that leads to an increased risk of tumors (benign and malignant) in the endocrine system (e.g., pituitary gland, hypothalamus, thyroid gland, parathyroid glands, adrenal glands, pancreas, testes, ovaries). More Information on Multiple Endocrine Neoplasia Syndrome: Endocrine System Cancer
Hereditary disorder in which endocrine glands develop excess normal tissue (hyperplasia) or adenoma (tumor). More Information on Multiple Endocrine Neoplasia Type 1: Diabetes & Endocrine Basics
A rare and inherited disorder that lead to tumors in the endocrine system, including the pituitary gland, pancreas and parathyroid gland. While usually benign (non-cancerous), tumors in the pancreas can become cancerous. More Information on Multiple Endocrine Neoplasia Type 1 Syndrome: Endocrine System Cancer
"Multiple Epiphyseal Dysplasia" is more commonly referred to as "Epiphyseal Dysplasia" in the medical community. Epiphyseal Dysplasia
Also Known As: "Fairbank Type Multiple Epiphyseal Dysplasia, Ribbing Type Multiple Epiphyseal Dysplasia, MED"
A rare inherited disorder affecting the head of the long bones (epiphyses). It usually involves shortened bones in the legs, hands and feet. Common symptoms include pain, inflammation and stiffness in the joints, particularly of the legs and hips. More Information on Epiphyseal Dysplasia: Bone Health
Pregnancy in which a woman is carrying two or more babies. This increases the risk to mother and infants and requires additional monitoring and preparation. In recent decades the number of multiple births in the United States has soared. More Information on Multiple Gestation: Pregnancy Basics
"Multiple Injections" is more commonly referred to as "Split Dose Regimen" in the medical community. Split Dose Regimen
Dividing a prescribed daily dose of insulin into two or more injections, taken over the course of a day, to improve control over blood glucose levels. More Information on Split Dose Regimen: Insulin
"Multiple Melanoma" is more commonly referred to as "Skin Cancer (Melanoma)" in the medical community. Skin Cancer (Melanoma)
Also Known As: "Malignant Melanoma, Skin Melanoma, Melanoma Mole, Melanoma in Situ"
A form of skin cancer that begins in the cells that produce pigment. Melanoma usually begins in a mole. It is the most serious type of skin cancer. More Information on Skin Cancer (Melanoma): Skin Cancer
Also Known As: "Plasma Cell Myeloma, Myeloma Bone Disease, Kahler's Disease, Myelomatosis, Multiple Myeloma Cancer"
A malignant tumor (cancer) of the plasma cells in bone marrow. Soft spots called osteolytic lesions develop in the bone and are seen as "holes" on x-rays. While affecting bone, it is considered a type of blood cancer. More Information on Multiple Myeloma: Leukemia & Bone Cancer
Also Known As: "Plasma Cell Myeloma, Kahler's Disease, Myeloma Bone Disease, Myelomatosis"
A malignant tumor (cancer) of the plasma cells in bone marrow. Soft spots called osteolytic lesions develop in the bone and are seen as "holes" on x-rays. While affecting bone, it is considered a type of blood cancer. More Information on Multiple Myeloma Cancer: Leukemia & Bone Cancer
"Multiple Personality Disorder" is more commonly referred to as "Dissociative Identity Disorder" in the medical community. Dissociative Identity Disorder
Also Known As: "DID, Split Personality Disorder, Multiple Personality Syndrome"
The presence of two or more distinct personalities, each with its own memories, behavior and relationships, controlling the body in turns with often abrupt transition. More Information on Dissociative Identity Disorder: Personality Disorders
"Multiple Personality Syndrome" is more commonly referred to as "Dissociative Identity Disorder" in the medical community. Dissociative Identity Disorder
Also Known As: "DID, Multiple Personality Disorder, Split Personality Disorder"
The presence of two or more distinct personalities, each with its own memories, behavior and relationships, controlling the body in turns with often abrupt transition. More Information on Dissociative Identity Disorder: Personality Disorders
Also Known As: "Multiple Birth, Multiple Gestation"
Pregnancy in which a woman is carrying two or more babies. This increases the risk to mother and infants and requires additional monitoring and preparation. In recent decades the number of multiple births in the United States has soared. More Information on Multiple Pregnancy: Pregnancy Basics
A disease of the central nervous system in which nerve-insulating myelin is destroyed. As communication between the brain and other parts of the body is disrupted, symptoms may occur that range from relatively benign to devastating. More Information on Multiple Sclerosis: Multiple Sclerosis
There is no cure for multiple sclerosis (MS). Therefore, treatment focuses around modifying the disease course, treating exacerbations, managing symptoms and improving function and safety. More Information on Multiple Sclerosis Treatment: Multiple Sclerosis
Degenerative disorders affecting the central and autonomic nervous systems. The three types are: olivopontocerebellar atrophy (movement and speech), striatonigral degeneration (Parkinsonism) and MSA with orthostatic hypotension (combination type). More Information on Multiple System Atrophy: Brain & Nerve Basics
A form of multiple system atrophy (MSA) that is characterized by a sudden, severe drop in blood pressure when rising from a seated or prone position (orthostatic hypotension). More Information on Multiple System Atrophy with Orthostatic Hypotension: Brain & Nerve Basics
"Multiplex Neuropathy" is more commonly referred to as "Focal Neuropathy" in the medical community. Focal Neuropathy
Also Known As: "Localized Nerve Damage, Focal Nerve Damage, Localized Nerve Failure, Focal Nerve Failure"
A type of diabetic neuropathy that affects certain nerves or a group of nerves, most often in the head, torso or leg. Onset is unpredictable and occurs most often in older patients. More Information on Focal Neuropathy: Neuropathy
Contagious viral disease that causes painful enlargement of the salivary or parotid glands (glands between the ear and jaw). It may also affect the testes, central nervous system and pancreas. Unvaccinated children are the most common patients. More Information on Mumps: Skin Related Infections
The most severe form of factitious disorder in which a person fabricates illness or injury to gain attention. It is associated with severe emotional difficulties and includes symptoms such as chest pain, stomach problems or fever. More Information on Munchausen Syndrome: Factitious & Related Disorders
A type of child abuse in which an adult causes real or apparent disease symptoms in a child. Typically, the abuser seeks unnecessary medical care for the child. It is rare and the cause is unknown. More Information on Munchausen Syndrome By Proxy: Factitious & Related Disorders
"Mural Endocarditis" is more commonly referred to as "Endocarditis" in the medical community. Endocarditis
Also Known As: "Rheumatic Endocarditis, Bacterial Endocarditis, Acute Endocarditis, Valvular Endocarditis, Infective Endocarditis"
An inflammation (most often from an infection) in vulnerable areas of the endocardium -- the innermost layer of the heart's chambers and valves. It most commonly affects individuals with existing valvular heart diseases or defects. More Information on Endocarditis: Heart Injuries & Infections
"Murine Typhus" is more commonly referred to as "Typhus" in the medical community. Typhus
Also Known As: "Typhus Fevers, Scrub Typhus, Epidemic Typhus, Tick Typhus"
A rickettsial disease caused by either Rickettsia prowazekii or Rickettsia typhi. Lice and fleas transmit this infectious disease to humans. It is marked by high fever, a transient rash and fairly severe illness. More Information on Typhus: Tropical Disease
"Murmur" is more commonly referred to as "Heart Murmur" in the medical community. Heart Murmur
Also Known As: "Continuous Murmur, Cardiac Murmur, Systolic Murmur, Diastolic Murmur"
An abnormal heart sound. It may stem from a heart valve problem or be "innocent" (unassociated with disease). It may increase the risk of infection from dental procedures, leading to the prophylactic use of antibiotics. More Information on Heart Murmur: Heart Signs & Symptoms
Specialized fibers in bundles that have the ability to lengthen and shorten (contract) to provide movement and support. Muscles attach to bone by tendons. There are three types: skeletal, smooth and cardiac.
"Muscle Contraction Headache" is more commonly referred to as "Tension Headache" in the medical community. Tension Headache
Also Known As: "Tension Type Headache, Depressive Headache, Stress Headache, Essential Headache, Psychogenic Headache, Ordinary Headache"
Head pain related to muscle tightening in the head, neck or scalp. It is the most common headache and is usually mild, but can become chronic in some patients. It does not involve the severe pain, nausea or vision problems associated with migraines. More Information on Tension Headache: Headache & Migraine
Medications that cause skeletal muscle contraction to cease. They may be used to treat certain dental illnesses, such as TMJ disorders. More Information on Muscle Relaxants: Oral Medications
"Muscular Rheumatism" is more commonly referred to as "Fibromyalgia" in the medical community. Fibromyalgia
Also Known As: "Fibromialgia, Fibrositis, Fibromyalgia Syndrome, Psychogenic Rheumatism, Fibromyositis, Chronic Rheumatism, Tension Myalgia"
A chronic disorder characterized by widespread musculoskeletal pain, fatigue, and tenderness in localized areas of the neck, spine, shoulders and hips called "tender points." More Information on Fibromyalgia: Fibromyalgia & Pain Disorders
Disease of the muscles or skeleton. Higher incidences of these disorders in patients with diabetes may be a result of high glucose (blood sugar) levels. More Information on Musculoskeletal Disorders & Diabetes: Diabetes & Endocrine Basics
Any pain that originates in the muscles or bones, and can include sore muscles, broken bones, torn ligaments and tendons, or medical conditions such as arthritis. More Information on Musculoskeletal Pain: Pain Basics
The system of muscles, tendons, ligaments, bones, joints and associated tissues that move the body and maintain its form. More Information on Musculoskeletal System: Pain Basics
"Mushroom Picker's Disease" is more commonly referred to as "Hypersensitivity Pneumonitis" in the medical community. Hypersensitivity Pneumonitis
Also Known As: "Farmer's Lung, Air Conditioner Lung, Bird Breeder's Lung, Extrinsic Allergic Alveolitis, Humidifier Lung"
An inflammation in the lungs caused by exposure to an allergen, usually organic dust. This dust may come from animal dander, molds, or plants. More Information on Hypersensitivity Pneumonitis: Breathing & Lung
"Musical Alexia" is more commonly referred to as "Alexia" in the medical community. Alexia
Also Known As: "Motor Alexia, Optic Alexia"
A loss (or lessening) of the ability to comprehend written language or to read aloud. It is caused by a lesion in the central nervous system (brain and spinal cord). Types include motor, musical and optic. More Information on Alexia: Neuro Signs & Symptoms
"Musician's Cramp" is more commonly referred to as "Writer's Cramp" in the medical community. Writer's Cramp
Also Known As: "Typist's Cramp, Pianist's Cramp"
A type of focal dystonia (sustained muscle contractions leading to twisting movements) involving the muscles of the hand and/or forearm. More Information on Writer's Cramp: Movement Disorders
"Mustard Procedure" is more commonly referred to as "Intraatrial Baffle" in the medical community. Intraatrial Baffle
Also Known As: "Atrial Switch Procedure, Venous Switch, Senning Procedure, Atrial Switch"
A surgery to relieve symptoms when the aorta and pulmonary artery are in reversed positions, before surgery can be done to correct the problem. A tunnel is created in the upper chambers of the heart (atria) to redirect blood flow. More Information on Intraatrial Baffle: Pediatric Heart
"MVP" is more commonly referred to as "Mitral Valve Prolapse" in the medical community. Mitral Valve Prolapse
Also Known As: "Billowing Mitral Cusp Syndrome, J.B. Barlow Syndrome, Floppy Valve Syndrome, Barlow Syndrome, Systolic Click Murmur Syndrome"
A condition in which the flaps of the mitral valve (located between the left atrium and left ventricle) are too large and cannot close properly. As a result, blood may leak back through the valve (regurgitation), when it should only move forward. More Information on Mitral Valve Prolapse: Heart Valve
"Myalgic Encephalomyelitis" is more commonly referred to as "Chronic Fatigue Syndrome" in the medical community. Chronic Fatigue Syndrome
Also Known As: "Chronic Fatigue and Immune Dysfunction Syndrome, ME, CFIDS, CFS, Postviral Fatigue Syndrome"
Disorder characterized by extreme fatigue that lasts six months or longer, and does not improve with rest or is worsened by physical or mental activity. It is often associated with fibromyalgia and myofascial pain syndrome. More Information on Chronic Fatigue Syndrome: Energy & Fatigue
A chronic autoimmune neuromuscular disease marked by degrees of skeletal-muscle weakness. Typified by muscle weakness that increases during periods of activity and improves after rest. Medications can control the disease. More Information on Myasthenia Gravis: Myopathy
A chronic autoimmune neuromuscular disease marked by degrees of skeletal-muscle weakness. Typified by muscle weakness that increases during periods of activity and improves after rest. Medications can control the disease. More Information on Myasthenia Gravis Disease: Myopathy
A family of slender, rod-shaped, aerobic bacteria. This includes the bacteria that cause tuberculosis and leprosy. More Information on Mycobacteria: Infectious Disease Basics
A type of bacteria that belongs to a group known as rapidly growing mycobacteria. It is found in water, soil and dust and often is transmitted through contaminated medications and products, including medical devices. More Information on Mycobacterium Abscessus Infection: Infectious Disease Basics
"Mycobacterium Avium" is more commonly referred to as "MAC Infection" in the medical community. MAC Infection
Also Known As: "MAC, Lady Windermere Syndrome, MAI, Mycobacterium Avium Intracellulare, Mycobacterium Avium Complex, Mycobacterium Avium Complex Infection"
A disorder that causes several different syndromes, including disseminated infections in people with HIV, pulmonary disease in people without compromised immune systems and cervical lymphadenitis in children. More Information on MAC Infection: Pneumonia & Lung Infection
"Mycobacterium Avium Complex" is more commonly referred to as "MAC Infection" in the medical community. MAC Infection
Also Known As: "MAC, Lady Windermere Syndrome, Mycobacterium Avium Complex Infection, MAI, Mycobacterium Avium, Mycobacterium Avium Intracellulare"
A disorder that causes several different syndromes, including disseminated infections in people with HIV, pulmonary disease in people without compromised immune systems and cervical lymphadenitis in children. More Information on MAC Infection: Pneumonia & Lung Infection
"Mycobacterium Avium Complex Infection" is more commonly referred to as "MAC Infection" in the medical community. MAC Infection
Also Known As: "MAC, Lady Windermere Syndrome, MAI, Mycobacterium Avium, Mycobacterium Avium Intracellulare, Mycobacterium Avium Complex"
A disorder that causes several different syndromes, including disseminated infections in people with HIV, pulmonary disease in people without compromised immune systems and cervical lymphadenitis in children. More Information on MAC Infection: Pneumonia & Lung Infection
"Mycobacterium Avium Intracellulare" is more commonly referred to as "MAC Infection" in the medical community. MAC Infection
Also Known As: "MAC, Mycobacterium Avium Complex, Lady Windermere Syndrome, Mycobacterium Avium Complex Infection, MAI, Mycobacterium Avium"
A disorder that causes several different syndromes, including disseminated infections in people with HIV, pulmonary disease in people without compromised immune systems and cervical lymphadenitis in children. More Information on MAC Infection: Pneumonia & Lung Infection
"Mycobacterium Tuberculosis Infection" is more commonly referred to as "Tuberculosis" in the medical community. Tuberculosis
Also Known As: "Tuberculosis Disease, Tubercular Infection, Consumption, TB"
An airborne bacterial infection that typically affects the lungs. Infants are frequently tested for this disease, which can remain dormant for a long time and can usually be treated with antibiotics. More Information on Tuberculosis: Pneumonia & Lung Infection
A family of parasitic, pathogenic microorganisms that lack a true cell wall. They also are gram-negative. One species is a primary cause of nonbacterial pneumonia More Information on Mycoplasma: Parasitic Disease
A type of bacteria that causes pneumonia. It is transmitted through exposure to respiratory secretions of an infected person and typically has an incubation period of one to four weeks. More Information on Mycoplasma Pneumoniae: Pneumonia & Lung Infection
A type of bacteria that causes pneumonia. It is transmitted through exposure to respiratory secretions of an infected person and typically has an incubation period of one to four weeks. More Information on Mycoplasma Pneumoniae Infection: Pneumonia & Lung Infection
"Mycosis Fungoides" is more commonly referred to as "Cutaneous T Cell Lymphoma" in the medical community. Cutaneous T Cell Lymphoma
Also Known As: "Sezary Syndrome, CTCL"
A type of non-Hodgkin's lymphoma (cancer of certain white blood cells, called lymphocytes). It most commonly affects the skin and can be misdiagnosed as dermatitis in its early stages. The chest or trunk often has patchy, itchy spots. More Information on Cutaneous T Cell Lymphoma: Lymphoma (Hodgkin's & Non)
A group of non-Hodgkin's lymphomas that first appear on the skin but can spread to the lymph nodes or major organs of the body. More Information on Mycosis Fungoides and Sezary Syndrome: Lymphoma (Hodgkin's & Non)
Toxic substances that occur naturally as a result of fungi or molds on agricultural crops. People who eat food made from contaminated crops may become sick. There are between 300 and 400 known mycotoxins. More Information on Mycotoxins: Infectious Disease Basics
Fatty material that surrounds some neurons and helps conduct nerve signals. Loss of myelin is related to several diseases, including multiple sclerosis. More Information on Myelin: Brain & Nerve Basics
The protective coating that surrounds the core of a nerve fiber (axon) and facilitates the transmission of nerve impulses. More Information on Myelin Sheath: Brain & Nerve Basics
"Myelinoclastic Diffuse Sclerosis" is more commonly referred to as "Schilder's Disease" in the medical community. Schilder's Disease
Also Known As: "Diffuse Sclerosis"
A progressive demyelinating disorder that is a variant of multiple sclerosis. It usually begins in childhood. Symptoms may include dementia, aphasia, seizures and personality changes. The course of the disease varies. More Information on Schilder's Disease: Pediatric Brain & Nerve
A condition in which the bone marrow does not function normally and can not produce enough blood cells. More Information on Myelodysplastic Disorders: Leukemia & Bone Cancer
Conditions that share properties of both myelodysplastic syndromes (bone marrow does not function normally and can not produce enough blood cells) and myeloproliferative diseases (too may blood cells are produced). More Information on Myelodysplastic Myeloproliferative Diseases: Leukemia & Bone Cancer
Also Known As: "Smoldering Leukemia, Myelodysplastic Disorders, Preleukemia"
A condition in which the bone marrow does not function normally and can not produce enough blood cells. More Information on Myelodysplastic Syndromes: Leukemia & Bone Cancer
An x-ray of the spinal cord after injection of a contrast agent into the space surrounding the spinal cord. It can reveal conditions such as spinal tumors, spinal cord swelling and herniated (slipped) discs. More Information on Myelogram: Pain Imaging Tests
An x-ray of the spinal cord after injection of a contrast agent into the space surrounding the spinal cord. It can reveal conditions such as spinal tumors, spinal cord swelling and herniated (slipped) discs. More Information on Myelography: Pain Imaging Tests
A form of leukemia that can be acute (acute myeloid leukemia or AML) or chronic (chronic myeloid leukemia or CML). There are also eight subtypes that are abbreviated as M0 to M7. More Information on Myeloid Cancers: Leukemia & Bone Cancer
A form of leukemia that can be acute (acute myeloid leukemia or AML) or chronic (chronic myeloid leukemia or CML). There are also eight subtypes that are abbreviated as M0 to M7. More Information on Myeloid Leukemias: Leukemia & Bone Cancer
Also Known As: "Pediatric Myeloid Leukemias, Juvenile Myeloid Leukemias"
Myeloid malignancies that can occur during childhood include acute myeloid leukemia (AML), myelodysplastic syndromes, juvenile myelomonocytic leukemia (JMML) and acute promyelocytic leukemia (APL). Treatment for all but APL are similar. More Information on Myeloid Leukemias in Children: Pediatric Cancer
Also Known As: "Pediatric Myeloid Leukemias, Juvenile Myeloid Leukemias, Myeloid Leukemias in Children"
Myeloid malignancies that can occur during childhood include acute myeloid leukemia (AML), myelodysplastic syndromes, juvenile myelomonocytic leukemia (JMML) and acute promyelocytic leukemia (APL). Treatment for all but APL are similar. More Information on Myeloid Malignancies in Children: Pediatric Cancer
A tumor of bone marrow cells that is usually malignant (cancerous). It is sometimes used as an abbreviation for a condition called multiple myeloma. More Information on Myeloma: Leukemia & Bone Cancer
Also Known As: "Plasma Cell Myeloma, Kahler's Disease, Myelomatosis, Multiple Myeloma Cancer"
A malignant tumor (cancer) of the plasma cells in bone marrow. Soft spots called osteolytic lesions develop in the bone and are seen as "holes" on x-rays. While affecting bone, it is considered a type of blood cancer. More Information on Myeloma Bone Disease: Leukemia & Bone Cancer
Also Known As: "Plasma Cell Myeloma, Kahler's Disease, Multiple Myeloma Cancer, Myeloma Bone Disease"
A malignant tumor (cancer) of the plasma cells in bone marrow. Soft spots called osteolytic lesions develop in the bone and are seen as "holes" on x-rays. While affecting bone, it is considered a type of blood cancer. More Information on Myelomatosis: Leukemia & Bone Cancer
"Myelomeningocele" is more commonly referred to as "Spina Bifida" in the medical community. Spina Bifida
Also Known As: "Spina Bifida Occulta, Open Spine, Meningocele"
A birth defect in which the backbone and spinal canal do not close before birth. In some cases, the spinal cord and its covering membranes may protrude out of an affected infant's back, a condition requiring surgery. More Information on Spina Bifida: Birth & Genetic Disorders
Also Known As: "Chronic Myelomonocytic Leukemia, Acute Myelomonocytic Leukemia"
A type of myeloproliferative disorder in which too myelomonocytes (a type of white blood cell) are being produced in the bone marrow. This crowds out other blood cells. It is usually chronic, but can become acute. More Information on Myelomonocytic Leukemia: Leukemia & Bone Cancer
Any condition of the spinal cord the results in a loss of sensory or motor function, including damage from trauma, injury or disease. More Information on Myelopathy: Head & Spine Injury
Also Known As: "Chronic Myeloproliferative Disorders"
A condition in which the bone marrow produces too many red blood cells, white blood cells or platelets. More Information on Myeloproliferative Disorders: Leukemia & Bone Cancer
"Myelosclerosis with Myeloid Metaplasia" is more commonly referred to as "Agnogenic Myeloid Metaplasia" in the medical community. Agnogenic Myeloid Metaplasia
Also Known As: "Chronic Idiopathic Myelofibrosis, Idiopathic Myelofibrosis, Primary Myelofibrosis"
A chronic, progressive disease in which blood is made in the liver, spleen or other body areas because the bone marrow has been replaced with fibrous tissue. It usually involves spleen enlargement and anemia. More Information on Agnogenic Myeloid Metaplasia: Leukemia & Bone Cancer
"Myocardial Infarction" is more commonly referred to as "Heart Attack" in the medical community. Heart Attack
Also Known As: "Acute Myocardial Infarction, MI, Acute MI, Acute Heart Attack, A Coronary"
Scarring, or death, of heart muscle due to lack of oxygen. Oxygen-rich blood is blocked by a blood clot in a coronary artery, usually due to plaque-related narrowing of the artery. More Information on Heart Attack: Cholesterol
"Myocardial ischemia" is more commonly referred to as "Cardiac Ischemia" in the medical community. Cardiac Ischemia
Also Known As: "Silent ischemia, Myocardium ischemia, Ischemic heart disease"
Ischemia is an episode of restricted blood flow to a major organ. Cardiac ischemia (restricted blood flow to the heart) could lead to a heart attack. More Information on Cardiac Ischemia: Cholesterol
"Myocardial Mapping" is more commonly referred to as "Cardiac Mapping" in the medical community. Cardiac Mapping
There are two types of cardiac mapping: electrophysiological mapping and imaging mapping. Both strategies involve the generation of a three-dimensional image of the heart and may be done in conjunction with cardiac catheterization. More Information on Cardiac Mapping: Heart Imaging & Rhythm Tests
"Myocardial Perfusion Imaging" is more commonly referred to as "Radionuclide Imaging & Heart Disease" in the medical community. Radionuclide Imaging & Heart Disease
Also Known As: "Nuclear Imaging & Heart Disease, Radioisotope Scanning & Heart Disease"
An imaging test that introduces tiny amounts of radioactive materials (called "tracers") into the body. The tracers emit energy that is used by gamma cameras to take very clear pictures of the desired area (e.g., the heart). More Information on Radionuclide Imaging & Heart Disease: Heart Imaging & Rhythm Tests
"Myocardial Resection" is more commonly referred to as "Endocardial Resection" in the medical community. Endocardial Resection
An open-heart surgery in which the surgeon selectively destroys the abnormal areas of the heart that are causing abnormal heart rhythms. This surgery may be done if a person has had a heart attack, or if a person has Wolff-Parkinson-White Syndrome. More Information on Endocardial Resection: Arrhythmia
"Myocardial Revascularization" is more commonly referred to as "Revascularization" in the medical community. Revascularization
Also Known As: "Cardiac Revascularization, Heart Revascularization"
he process or practice of restoring blood flow to a body part. In the case of the heart, this is done by surgery such as bypass surgery, or by dissolving blood clots with medications called "clot busters." More Information on Revascularization: Vascular Disease
"Myocardial Stunning" is more commonly referred to as "Cardiac Stunning" in the medical community. Cardiac Stunning
Also Known As: "Heart Stunning"
Temporary heart failure due to an event such as open-heart surgery or use of a heart-lung machine. The stunned heart cannot pump enough blood to meet the body's needs. It normally passes in a few days, but it can be fatal. More Information on Cardiac Stunning: Heart Failure
Also Known As: "Fulminant Myocarditis, Acute Myocarditis"
A rare and potentially life-threatening inflammation of the cardiac muscle that could cause heart failure. Myocarditis can be cause by a viral infection. More Information on Myocarditis: Heart Injuries & Infections
"Myocardium ischemia" is more commonly referred to as "Cardiac Ischemia" in the medical community. Cardiac Ischemia
Also Known As: "Silent ischemia, Ischemic heart disease, Myocardial ischemia"
Ischemia is an episode of restricted blood flow to a major organ. Cardiac ischemia (restricted blood flow to the heart) could lead to a heart attack. More Information on Cardiac Ischemia: Cholesterol
"Myoclonic Encephalopathy of Infants" is more commonly referred to as "Opsoclonus Myoclonus" in the medical community. Opsoclonus Myoclonus
Also Known As: "Dancing Eyes Dancing Feet Syndrome, Kinsbourne Syndrome"
A neurological disorder marked by unsteady gait, myoclonus (brief muscle spasms) and opsoclonus (rapid eye movements). Other symptoms include difficulty speaking, It may occur in association with tumors or viral infections. More Information on Opsoclonus Myoclonus: Movement Disorders
A type of generalized seizure that causes rapid, brief contractions of body muscles. This may cause sudden, jerky movements and clumsiness. More Information on Myoclonic Seizures: Epilepsy & Seizure
Sudden, involuntary jerking of a muscle or muscle group. In its simplest form, myoclonus consists of a muscle twitch followed by relaxation (e.g., hiccup). More widespread myoclonus involves persistent contractions in a group of muscles. More Information on Myoclonus: Movement Disorders
Specialized cells in the breasts that squeeze milk into the milk ducts or "letdown" during breastfeeding. More Information on Myoepithelial Cells: Breast Health
Also Known As: "MPS, Myofascial Pain Dysfunction, Myofascial Syndrome"
A disorder in which trigger points within the muscles and fasciae (myofascia) become abnormally active. The result is pain both in the local area and radiating along the line of the muscles. More Information on Myofascial Pain Disorder: Fibromyalgia & Pain Disorders
Also Known As: "MPS, Myofascial Syndrome, Myofascial Pain Disorder"
A disorder in which trigger points within the muscles and fasciae (myofascia) become abnormally active. The result is pain both in the local area and radiating along the line of the muscles. More Information on Myofascial Pain Dysfunction: Fibromyalgia & Pain Disorders
Also Known As: "Myofascial Pain Disorder, MPS, Myofascial Pain Dysfunction, Myofascial Syndrome"
A disorder in which trigger points within the muscles and fasciae (myofascia) become abnormally active. The result is pain both in the local area and radiating along the line of the muscles. More Information on Myofascial Pain Syndrome: Fibromyalgia & Pain Disorders
Also Known As: "MPS, Myofascial Pain Disorder, Myofascial Pain Dysfunction"
A disorder in which trigger points within the muscles and fasciae (myofascia) become abnormally active. The result is pain both in the local area and radiating along the line of the muscles. More Information on Myofascial Syndrome: Fibromyalgia & Pain Disorders
"Myogram" is more commonly referred to as "Electromyogram" in the medical community. Electromyogram
Also Known As: "EMG, Electromyography, EMG Test"
A test that measures the electrical activity generated by active muscles. It assesses nerve function and diagnoses causes of muscle problems (e.g., weakness, twitching, paralysis). It is often done along with a nerve conduction velocity study. More Information on Electromyogram: Brain & Nerve Tests
Also Known As: "Abdominal Myomectomy, Laparoscopic Myomectomy, Hysteroscopic Myomectomy"
A procedure in which a surgeon remove a uterine fibroid while leaving the healthy areas of the uterus in place. Types include laparoscopic myomectomy, hysteroscopic myomectomy and abdominal myomectomy. More Information on Myomectomy: Uterine & Ovarian Health
A type of pelvic inflammatory disease in which an infection rises from the vagina or cervix into the uterine wall. More Information on Myometritis: Uterine & Ovarian Health
The middle layer of the uterine wall, also the thickest layer. It is composed of smooth, involuntary muscle that contracts during menstruation to help shed the inner layer (endometrium). It also contracts during childbirth. More Information on Myometrium: Uterine & Ovarian Health
Also Known As: "Inheritable Myopathy, Acquired Myopathy"
Diseases that affect skeletal muscles (muscles that attach to bone). They may be inherited (e.g., muscular dystrophy) or caused by problems with the endocrine or metabolic systems. There are many types. Most cause muscle weakness and deterioration. More Information on Myopathy: Myopathy
Nearsightedness, or poor distance vision. A type of refractory error caused by the eye's inability to bend light correctly, resulting in blurred vision. More Information on Myopia: Pediatric Hearing & Vision
A term used to describe several conditions involving inflammation of the muscle, including polymyositis (many muscles are affected), dermatomyositis (skin is also affected) and inclusion body myositis (progressive wasting of the upper extremities). More Information on Myositis: Fibromyalgia & Pain Disorders
A neuromuscular disorder marked by the slow relaxation of the muscles after voluntary contraction or electrical stimulation. It may be static or progressive. The condition typically improves after the muscles have warmed up. More Information on Myotonia: Movement Disorders
Also Known As: "Becker's Myotonia, Thomsen's Myotonia"
Any muscle disorder present at birth. This includes hundreds of distinct neuromuscular syndromes and disorders. Loss of muscle tone and muscle weakness in infancy and delayed motor milestones (e.g., walking) are typical. More Information on Myotonia Congenita: Birth & Genetic Disorders
An exercise stress test that introduces a radionuclide substance, such as thallium, to create images of the heart before, during and after physical exertion. More Information on Nuclear Stress Test: Heart Imaging & Rhythm Tests
Also Known As: "Tympanostomy Tubes, Ear Tube Surgery"
Surgical procedure to drain fluid from the ears and insert tubes in the ear drums, which equalizes pressure between the middle and outer ear. Performed to treat recurring ear infections, which may be related to allergies. More Information on Myringotomy: Ear Conditions
"Myxoma" is more commonly referred to as "Cardiac Myxoma" in the medical community. Cardiac Myxoma
Also Known As: "Atrial Myxoma"
A rare, mucus-filled tumor (myxoma), that usually begins in the left atrium of the heart. Symptoms of atrial myxoma include (but are not limited to) angina, shortness of breath and palpitations.
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