Alveolar soft part sarcoma (ASPS) is a rare type of cancer that affects soft tissues such as muscles, tendons, and ligaments. It usually occurs in the lower extremities, but can also occur in other parts of the body. ASPS is a slow-growing cancer ...

Alveolar soft tissue sarcoma (ASTS) is a rare type of cancer that affects the soft tissues of the body, such as fat, muscle, nerves, and blood vessels. It is most commonly found in the arms, legs, and trunk, but can also occur in other parts of th...

Alveolitis, Extrinsic Allergic is a type of lung inflammation caused by an allergic reaction to inhaled substances. It is also known as hypersensitivity pneumonitis or extrinsic allergic alveolitis. Symptoms of this condition include shortness of ...

ALys amyloidosis is a rare, inherited form of amyloidosis caused by mutations in the ALys gene. It is characterized by the buildup of abnormal proteins in the body's organs and tissues, which can lead to organ failure. Symptoms of ALys amyloidosis...

Alzheimer's disease is a progressive neurologic disorder that causes the brain to shrink (atrophy) and brain cells to die. Alzheimer's disease is the most common cause of dementia — a continuous decline in thinking, behavioral and social ski...

Alzheimer's disease is a progressive neurologic disorder that causes the brain to shrink (atrophy) and brain cells to die. Alzheimer's disease is the most common cause of dementia — a continuous decline in thinking, behavioral and social ski...

Amaurosis-hypertrichosis syndrome is a rare genetic disorder characterized by a combination of vision loss (amaurosis) and excessive hair growth (hypertrichosis). It is caused by a mutation in the GNAQ gene, which is responsible for the production...

Amblyopia, also known as lazy eye, is a vision development disorder in which an eye fails to achieve normal visual acuity, even with prescription eyeglasses or contact lenses. It is the most common cause of vision problems in children. Amblyopia i...

Amelia of lower limb is a congenital disorder in which one or more of the bones in the lower limb are missing. It is a rare condition that affects the development of the lower limb, usually the thighbone (femur) or the shinbone (tibia)....

Amelia of upper limb is a congenital disorder in which one or more of the bones in the arm or hand are missing. It is a rare condition that affects about 1 in every 30,000 births. Symptoms may include a short arm, a hand with fewer than five finge...

Amelo-onycho-hypohidrotic syndrome, also known as Hay-Wells syndrome, is a rare genetic disorder that affects the development of the skin, nails, and sweat glands. It is caused by a mutation in the TP63 gene, which is responsible for the developme...

Ameloblastic carcinoma is a rare and aggressive type of cancer that affects the cells of the jawbone. It is a malignant tumor that is composed of both epithelial and mesenchymal cells. It is usually found in the mandible or maxilla and can spread ...

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...