Intraductal papillary bile duct adenocarcinoma and gastrointestinal stromal tumor in a case of neurofibromatosis type 1

Figure 4 Histologic findings of gastrointestinal stromal tumor. A: A mass with rounded border, resected from the third portion of the duodenum. (HE, 40 × magnification); B: The resected duodenal mass contained many spindle cells. (HE, 100 ×); C: Positive immunohistochemistry for c-kit suggested GIST. (c-kit immunostain, 100 ×). 300 mm × 225 mm (300 × 300 DPI). GIST: Gastrointestinal stromal tumor.