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Malignant gastrointestinal tumor (GIST) of the esophagus, microscopic appearance. The tumor demonstrated (A) overall dense cellularity, a mixture of (B) epithelioid and (C) spindled areas growth, and brisk (11/50 high power fields) mitotic activity with about 10% necrosis (not illustrated), all of which contribute to this tumor being designated as malignant.
