Undifferentiated Pleomorphic Sarcoma

Section Editor: Dharam M. Ramnani, MD

Virginia Urology, Richmond, VA, USA

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Undifferentiated Pleomorphic Sarcoma (UPS) of the Kidney: This is an example of retroperitoneal UPS with secondary renal involvement. The tumor formed multiple large, fleshy nodules which surrounded the kidney.
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Image 104 of 107

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