NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,406 terms related to cancer and medicine.
We offer a widget that you can add to your website to let users look up cancer-related terms. Get NCI’s Dictionary of Cancer Terms Widget.
- A rare condition in which too many mast cells (a type of white blood cell) build up in certain tissues and organs in the body, including the bone marrow, lymph nodes, bone, liver, spleen, and small intestine. ASM may get worse quickly and cause severe symptoms and organ damage. Sometimes, it may become mast cell leukemia (a very rare type of leukemia). ASM usually occurs in adults. Also called aggressive systemic mastocytosis.