Amyloidosis: A rare group of metabolic disorders where a protein called amyloid accumulates in body organs and tissues where it can cause damage and is potentially fatal. Symptoms depend on the organs involved. There are numerous forms of the condition: primary amyloidosis, secondary amyloidosis, hemodialysis-associated amyloidosis and familial amyloidosis.
Thrombocytopenic purpura, autoimmune: A rare blood disorder where a low number of platelets impairs the bloods ability to clot and results in bleeding into the skin and mucous membranes.
Thrombotic thrombocytopenic purpura, acquired: A rare blood condition where small blood clots form in blood vessels which reduces the number of blood platelets and results in kidney failure, neurological symptoms and anemia. The condition may be familial or acquired - symptoms tend to recur regularly in the familial form.