Section Editor: Dharam M. Ramnani, MD

Virginia Urology, Richmond, VA, USA

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Strong immunoreactivity for S-100 was seen in this case. Most granular cell tumors pursue a benign course. There are well-documented cases of "benign-appearing" granular cell tumors that produced distant metastases. Features favoring malignancy include necrosis, high mitotic activity, spindling of tumor cells, and prominent nucleoli.

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