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Staging with Unilateral Salpingo-Oophorectomy and Expert Pathological Review Result in No Recurrences in a Series of 81 Intestinal-Type Mucinous Borderline Ovarian Tumors

Objective: Recent studies suggest that mucinous borderline ovarian tumors (MBOTs) belong to a high-risk group that is more likely to develop an invasive recurrence. The objective is to determine these risk factors. Methods: A monocentric retrospective review of all consecutive patients with intestinal-type MBOT diagnosed between 1993 and 2013. All tumors were evaluated by one pathologist without knowledge of clinical outcome. Extensive surgical staging and pathological tumor sampling (1 block/cm diameter in tumors <10 cm and 2 blocks/cm diameter in tumors >10 cm) were performed in all cases. Results: A total of 81 patients were included. Patients with micro-invasion were also included. None of the patients recurred. No bilateral tumors, nor tumors with International Federation of Gynecology and Obstetrics stage II or higher, were diagnosed. Median follow-up was 87 months. Conclusions: In our series of pure intestinal-type MBOT, including micro-invasion, no recurrences were observed. Given the heterogeneity of these tumors staging with at least unilateral salpingo-oophorectomy, extensive pathological sampling, and expert pathological review are of paramount importance to be able to diagnose a pure intestinal-type MBOT and excluding gastrointestinal mucinous tumors and more important, excluding an invasive focus, defining a mucinous ovarian carcinoma. When these conditions are fulfilled, the prognosis of pure intestinal-type MBOT is excellent.