A case of granulosa cell tumor of the ovary detected from metastatic foci

The authors report a case of granulosa cell tumor of the ovary that followed a rare clinical course, where the primary focus did not appear as a mass, and disseminated foci grew in the abdominal cavity. In 2008, a 70-year-old patient, gravida 6 and para 3, was diagnosed with a perihepatic mass, peritoneal dissemination, and an abdominal wall mass as confirmed by computed tomography (CT) scanning. There was no mass lesion in the pelvis. The pathological diagnosis based on the resected mass in the abdominal wall was malignant mesothelioma. During follow-up, abdominal bloating developed from April 2009. CT scans indicated growth of the intraperitoneal lesions. Therefore, the patient received two cycles of combination therapy with cisplatin and pemetrexed. The treatment was discontinued due to lack of efficacy. The intraperitoneal lesions grew but the clinical course was slow and inconsistent with that of malignant mesothelioma. Central pathological review was requested in April 2011, and a granulosa cell tumor was diagnosed. The patient was referred to the department for detailed examination and treatment. The patient underwent incision of the intraperitoneal tumors, simple total hysterectomy, bilateral salpingo-oophorectomy, and omentectomy. The final pathological diagnosis was normal-size adult-type granulosa cell tumor originating from the left ovary. It was a case of granulosa cell tumor without ovarian enlargement where growth of the metastatic foci was the major observation. As complete surgical resection was achieved and no additional therapy was given, the subject was followed on an outpatient basis and no recurrence was identified.

Granulosa cell tumor; A rare clinical course; Debulking surgery

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