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Histopathologic features of schwannoma (specimens from a 36-year-old woman). (a) Photograph of a gastrectomy specimen shows a slightly lobulated, but well-circumscribed, homogeneous intramural tumor. (b) Low-power photomicrograph (original magnification, ×20; hematoxylin-eosin stain) shows that the tumor retains its circumscription and pushes into the submucosa. The tumor is cuffed by lymphoid aggregates (arrowheads), a characteristic feature of schwannomas in this location.
