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Desmoplastic small round cell tumor. (a) The tumor shows nests of small round tumor cells within desmoplastic fibrous stroma. (b) The tumor cells are positive for cytokeratin (AE1/AE3) (left) and show perinuclear dot-like expression for desmin (right) (H&E stain, original magnification 200× a; cytokeratin (AE1/AE3) and desmin immunostain, original magnification 200× b).
