NCI Dictionary of Cancer Terms

The NCI Dictionary of Cancer Terms features 8,573 terms related to cancer and medicine.

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A family of rare tumors that form in the soft tissues of the stomach, intestines, lungs, female reproductive organs, and genitourinary organs. Most PEComas are benign (not cancer). They often occur in children with an inherited condition called tuberous sclerosis. Also called perivascular epithelioid cell tumor.