gastrointestinal stromal tumor
(GAS-troh-in-TES-tih-nul STROH-mul TOO-mer)
A type of tumor that usually begins in cells in the wall of the gastrointestinal tract. It can be benign or malignant. Also called GIST.
Gastrointestinal stromal tumors (GISTs) may be found anywhere in or near the gastrointestinal tract.