Wiktionary
mastocytosis
n. (context neurology pathology English) A disorder caused by an overabundance of mastocytes in the body.
Wikipedia
Mastocytosis
Mastocytosis, one of the mast cell diseases, is a rare mast cell activation disorder of both children and adults caused by the presence of too many mast cells (mastocytes) and CD34+ mast cell precursors.
People affected by mastocytosis are susceptible to itching, hives, and anaphylactic shock, caused by the release of histamine from mast cells. The current classifications, definitions and diagnostic criteria for mastocytosis are being reviewed for revision to better describe the collection of related disorders.