Granulosa cell tumor constitutes approximately 1% of all ovarian tumors. Extraovarian spread can occur as a late recurrence. The authors reported a case of 41-year-old woman with adult-type granulosa cell tumor at sigmoid colon. The patient visited the outpatient department for a yearly medical check-up with no specific complaints. She had a history of ovarian cystectomy 12 years prior. A mass in left pelvic cavity was revealed upon transvaginal ultrasonography and computer tomography (CT). At the time of laparoscopy, a well-defined subserosa mass was detected at the antimesenteric side of the sigmoid colon. The right and left ovaries appeared grossly normal. The tumor was successfully removed with laparoscopic sigmoidectomy. The pathologic findings were that of adult-type granulosa cell tumor, which was corresponding to the previous diagnosis made in the ovarian cystectomy specimen 12 years ago. The authors presented this case as an example of late recurrence of ovarian granulosa cell tumor in sigmoid colon, which could potentially be mistaken as other usual colonic tumors in the absence of previous history of ovarian tumor.

Keywords: Colonic granulosa cell tumor; Extraovarian granulosa cell tumor; Sex cord-stromal tumor

DOI: 10.35755/jmedassocthai.2022.10.13673

Received 6 June 2022 | Revised 19 August 2022 | Accepted 1 September 2022