Mastocytosis

Mastocytosis by itself is a disorder caused by the presence of too many mast cells in the body. Mast cells are found in the skin, lymph nodes, internal organs (such as the liver and spleen) and the linings of the lung, stomach, and intestine. Mast cells play an important role in helping your immune system defend these tissues from disease. Mast cells attract other key players of the immune defense system to areas of your body where they are needed by releasing chemical “alarms” such as histamine and cytokines.

To be reportable, it must state systemic mastocytosis (9741/3).