PMC3618098_01
Excised tumor with a part of the stomach. The gastric mucosa can be seen in the lower part of the specimen.
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F1
On gross examination, the tumor measured 34 cm in its greatest dimension, with notable hemorrhage and necrosis (fig. 1).
a Hematoxylin and eosin staining of the tumor shows a mildly eosinophilic cytoplasm. b CD117 staining with a membranous distribution is shown.
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F2
Microscopic examination and immunohistochemical staining confirmed the tumor to be a GIST with tumor cells staining positive for CD117 (fig. 2a, b).