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Endometriosis of Ureter

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This ureteral biopsy is from a 52 y/o female who presented with intermittent gross hematuria. Work-up revealed right-sided hydronephrosis and a 4 cm pelvic mass. Ureteroscopy showed a polypoid, inflammatory-appearing lesion in the distal ureter which turned out to be endometriosis (shown here). Benign endometriotic gland are surrounded by typical stroma. The pelvic mass underwent CT-guided needle biopsies which showed endometrioma.

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