A bulky polyploid malignant tumor of the esophagus, composed of spindle cells with a focus of squamous cell carcinoma; spindle cells may be epithelial or metaplastic malignant fibroblasts.

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pseu·do·sar·co·ma (soo″do-sahr-koґmə) [pseudo- + sarcoma] sarcomatoid transformation of a carcinoma histologically resembling a sarcoma; cf. carcinosarcoma.

Medical dictionary. 2011.

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