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Leiomyosarcoma with Synchronous Clear Cell Ovarian Carcinoma

Background: Uterine leiomyomas are typically considered benign lesions. Despite aggressive management, they can be unpredictable and eventually exhibit disease recurrence several years following initial treatment. Case Report: We report a case involving a 55-year-old woman who was treated for a uterine leiomyoma at an outside medical institution 20 years ago. In November 2009, she presented to our gynecologic oncology service with a complex mass. Following surgery, the patient was diagnosed with a 16 cm ovarian mass and a synchronous leiomyosarcoma; the latter neoplasm appeared to originate from a previously resected uterine leiomyoma. Conclusions: The coexistence of these two lesions is exceedingly rare. We suspect that the leiomyosarcoma developed from either the patient’s original uterine leiomyoma or leiomyomatosis peritonealis disseminata.