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Anti-neutrophil? cytoplasmic antibody-associated vasculitis—shortened to AAV—is a group of rare autoimmune? diseases where a person’s immune system makes antibodies (called ANCAs) that mistakenly target proteins inside...
Anti-HLA hyperimmunization means a person’s immune system has made very high levels of antibodies against other people’s HLA proteins (human leukocyte? antigens). HLA proteins sit on...
Antoni’s Palsy is an idiopathic?, acute?, unilateral paresis or paralysis of the face in a pattern consistent with peripheral facial nerve dysfunction, and may be partial...
Aplastic anemia? is a rare condition where your body doesn’t produce enough blood cells. It’s like your bone marrow, the place where blood cells are made,...
Aplastic anemia? is a rare but serious blood disorder in which the bone marrow fails to produce enough new blood cells—red blood cells, white blood cells,...
Aplastic marrow failure is a serious condition where the bone marrow stops making enough blood cells. The bone marrow is the soft “factory” inside your bones...
Aplastic pancytopenia?, often called aplastic anemia?, is a rare but serious blood disorder. “Aplastic” means “failure to form,” and “pancytopenia?” means “low levels of all three...
Apparent mineralocorticoid excess is a rare condition where the body acts as if it has too much aldosterone (the salt-retaining hormone), even though aldosterone is low....
Argentine hemorrhagic fever? (AHF) is a serious viral? illness caused by the Junín virus (a New World arenavirus). People usually get it after contact with infected...
Arginine vasopressin deficiency (AVP-D) is a condition where your body does not make enough of the hormone arginine vasopressin (also called antidiuretic hormone, ADH). This hormone...
Argininosuccinase deficiency (also called argininosuccinic aciduria, ASA) is a rare, inherited urea-cycle disorder. The urea cycle is the body’s main way to turn toxic ammonia (made...
ASL deficiency is a rare inherited condition of the urea cycle—the body’s “nitrogen disposal” system. In healthy people, the urea cycle turns toxic ammonia (made when...
