Ameloblastoma is a rare, benign tumor of the jawbone that usually affects the mandible (lower jaw). It is a slow-growing tumor that can cause facial disfigurement if left untreated. It is most common in adults between the ages of 30 and 50, and is...

Amelocerebrohypohidrotic syndrome is a rare genetic disorder that affects the development of the brain, skin, and sweat glands. It is caused by a mutation in the FOXI1 gene. Symptoms of this disorder include intellectual disability, seizures, hear...

Amelogenesis Imperfecta is a rare genetic disorder that affects the development of tooth enamel. It is caused by mutations in the genes responsible for the production of enamel proteins. Symptoms of the disorder include discolored, pitted, or chal...

Amelogenesis Imperfecta is a rare genetic disorder that affects the development of tooth enamel. People with this condition have abnormal enamel formation, which can result in teeth that are discolored, pitted, or prone to rapid wear and breakage....

Amenorrhea facts Amenorrhea refers to the absence of menstrual periods; it may be either primary (meaning a woman never developed menstrual periods) or secondary (absence of menstrual periods in a woman who was previously menstruati...

Aminopterin/methotrexate embryofetopathy is a rare birth defect caused by the use of the drugs aminopterin or methotrexate during pregnancy. These drugs are used to treat certain types of cancer, autoimmune diseases, and other conditions. When tak...

Amish lethal microcephaly is a rare genetic disorder that affects the Amish population. It is characterized by a small head size, severe intellectual disability, and early death. It is caused by a mutation in the ASPM gene, which is responsible fo...

Amish nemaline myopathy is a rare, inherited neuromuscular disorder that affects the muscles of the body. It is caused by mutations in the NEB gene, which is responsible for producing a protein called nebulin. Symptoms of the disorder include musc...

Amniotic Band Syndrome (ABS) is a rare congenital disorder caused by entrapment of fetal parts in fibrous amniotic bands while in utero. These bands can constrict and interfere with normal development of the affected area, leading to a variety of ...

Amniotic fluid embolism (AFE) is a rare but serious condition that occurs when amniotic fluid, which surrounds a baby in the uterus during pregnancy, or fetal material, such as hair, enters the mother's bloodstream. This can cause a severe reactio...

Amoebiasis is an infection of the intestines caused by the parasite Entamoeba histolytica. It is a common cause of diarrhea and can lead to serious complications if left untreated. Symptoms may include abdominal pain, diarrhea, and bloody stools. ...

Amoebiasis is an infection caused by a group of single-celled parasites called Entamoeba histolytica. These parasites are free-living amoebae, meaning they can survive and reproduce outside of a host organism. They are found in contaminated food a...

Amoebic keratitis is an infection of the cornea caused by the amoeba Acanthamoeba. It is a rare but serious eye infection that can cause vision loss if left untreated. Symptoms of amoebic keratitis include redness, pain, light sensitivity, blurred...

Amyloidosis is a rare condition in which abnormal proteins called amyloid build up in the body's organs and tissues. It can affect many different organs, including the heart, kidneys, liver, spleen, and nervous system. Symptoms vary depending on t...

Amyloidosis cutis dyschromia is a rare skin condition caused by the accumulation of amyloid proteins in the skin. It is characterized by patches of discolored skin, usually on the face, neck, and upper chest. The patches may be light or dark in co...

Amyotrophic lateral sclerosis facts Amyotrophic lateral sclerosis is a rapidly progressive, invariably fatal neurological disease that attacks the nerve cells responsible for controlling voluntary muscles. Amyotrophic late...

Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease that affects nerve cells in the brain and the spinal cord. It is also known as Lou Gehrig's disease, after the famous baseball player who was diagnosed with the conditi...