CT of gastrointestinal stromal tumor (GIST)

(A) Axial image of a contrast-enhanced CT scan of the abdomen, showing a 4 cm hyperenhancing mass arising from the submucosa of the body of the stomach.
(B) Axial image of a contrast-enhanced CT scan of the abdomen of a patient who presented with gastrointestinal bleeding. Exophytic GIST arising from the second portion of the duodenum, with area of ulceration along the descending duodenum into the mass.