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Soft Tissue Pathology Flashcards
An intra-abdominal neoplasm arising in the pelvis of a 28-year-old man is composed of nests of small round cells embedded in dense fibrous stroma. The cells show positivity for vimentin, desmin, EMA, and focal positivity for CD99. Calretinin is negative. What is the most likely diagnosis?
Desmoplastic small round cell tumor