Annular lichen planus is a type of skin condition that is characterized by raised, scaly, and itchy patches on the skin. It is caused by an autoimmune reaction, and it can affect any area of the body, including the scalp, nails, and mucous membran...

Anoctamin-5-related limb-girdle muscular dystrophy R12 is a rare, inherited disorder that affects the muscles. It is caused by mutations in the ANO5 gene, which is responsible for producing anoctamin-5, a protein involved in muscle contraction. Sy...

Anodontia is a rare condition in which a person is born without any teeth. It is a congenital disorder, meaning it is present at birth. People with anodontia may have difficulty eating and speaking, and may require dentures or other dental prosthe...

Anodontia is a rare genetic disorder characterized by the complete absence of teeth. It can affect both primary (baby) teeth and permanent teeth. Anodontia can be either isolated, meaning it occurs on its own, or it can be part of a syndrome that ...

Anomalous aortic origin of the left coronary artery (AAOLCA) is a rare congenital heart defect in which the left coronary artery arises from the aorta instead of the pulmonary artery. This can lead to decreased blood flow to the left side of the h...

Anomalous aortic origin of the right coronary artery (AAORCA) is a rare congenital heart defect in which the right coronary artery originates from the aorta instead of the left coronary artery. This can lead to decreased blood flow to the right si...

Anomalous origin of coronary artery from the pulmonary artery (AOCA) is a rare congenital heart defect in which one of the coronary arteries arises from the pulmonary artery instead of the aorta. This can lead to decreased blood flow to the heart ...

An anomaly of the mitral subvalvular apparatus is a congenital heart defect in which the mitral valve does not close properly due to an abnormal structure of the subvalvular apparatus. This can lead to a leaky mitral valve, which can cause blood t...

Anonychia congenita totalis is a rare genetic disorder characterized by the absence of all fingernails and toenails. It is caused by a mutation in the gene that is responsible for the formation of the nail bed. Symptoms of this disorder include th...

Anonychia with flexural pigmentation is a rare skin condition characterized by the absence of fingernails and toenails, along with darkening of the skin in the folds of the body, such as the armpits, groin, and neck. It is usually seen in children...

Anonychia-microcephaly syndrome is a rare genetic disorder characterized by the absence of fingernails and toenails (anonychia) and a small head size (microcephaly). It is caused by a mutation in the gene that codes for the protein filamin A. Symp...

Anonychia-onychodystrophy syndrome is a rare genetic disorder characterized by the absence of fingernails and toenails, as well as other nail abnormalities. It is caused by mutations in the gene that encodes the protein keratin 16. Symptoms of the...

Anophthalmia and Microphthalmia are two rare eye conditions that affect the development of the eyes. Anophthalmia is a condition in which one or both eyes are absent at birth, while Microphthalmia is a condition in which one or both eyes are abnor...

Anophthalmia plus syndrome is a rare genetic disorder characterized by the absence of one or both eyes (anophthalmia) and a variety of other physical abnormalities. These can include malformations of the head and face, skeletal abnormalities, and ...

Anophthalmia-megalocornea-cardiopathy-skeletal anomalies syndrome (AMCS) is a rare genetic disorder characterized by the absence of one or both eyes (anophthalmia), abnormally large corneas (megalocornea), heart defects (cardiopathy), and skeletal...

Anophthalmia/microphthalmia-esophageal atresia syndrome is a rare genetic disorder characterized by the absence of one or both eyes (anophthalmia/microphthalmia) and a birth defect of the esophagus (esophageal atresia). This disorder is caused by ...

Anorexia nervosa facts Anorexia nervosa is a a psychiatric condition, which is part of a group of eating disorders. The cause of anorexia has not been definitively established, but self-esteem and body-image issues, societ...