PMC4353939_01
(A) Hematoxylin and eosin-stained section shows a circumscribed submucosal mass with spindle cells arranged in nests and trabeculae. (B) Rare ganglion cells were identified, scattered within the spindle cell compartment.
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Histologic evaluation revealed a well-circumscribed, non-encapsulated tumor based in the submucosa and muscularis propria of the duodenum (Fig. 1A). Only rare scattered ganglion-like cells were identified (Fig. 1B).