Gastrointestinal stromal tumor of the ampulla of Vater: A case report

Figure 1 A submucosal tumor with central ulceration at the ampulla of Vater.

Figure 2 Endoscopic ultrasonography revealed a round, low-echoic mass.

Figure 3 Enhanced computed tomography scan revealed a smooth-outlined hypervascular solid mass.

Figure 4 Mass showed low signal intensity on T1-weighted images (A) and high signal intensity on T2-weighted images (B).

Figure 5 Microscopic examination revealed a spindle-cell neoplasm (A, hematoxylin and eosin, × 200), and the tumor cells were positive for c-kit (B, × 200) and CD34 (C, × 200).