In 2014, the US Food and Drug Administration issued a safety communication warning against the use of power morcellators during laparoscopic hysterectomy or myomectomy. We report a case of peritoneal leiomyosarcomatosis attributable to power morcellation. A 49-year-old nulligravid woman presented with a huge uterine tumor measuring 15 × 8 cm that was diagnosed as benign leiomyoma on magnetic resonance imaging. The uterine tumor had shrunk to 13 × 7 cm after five treatment courses with a gonadotropin-releasing hormone agonist. She underwent laparoscopic hysterectomy using power morcellation; postoperative pathological diagnosis was benign leiomyoma. After 6 months, urinary ascites developed because of right ureteral rupture. She underwent laparotomy and was diagnosed with peritoneal leiomyosarcomatosis. Meticulous and thorough reevaluation of the morcellated specimens revealed a small component of leiomyosarcoma. Use of power morcellation should be minimized until the advent of novel methods that can perfectly differentiate benign from malignant uterine tumors preoperatively.
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