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Tumors of the appendix sometimes mimic right ovarian tumors. In postmenopausal women, distinguishing between these tumors preoperatively is difficult because the normal ovarian structures cannot be confirmed. We experienced a case of a mucinous cystic tumor of the appendix that was preoperatively misdiagnosed as an ovarian cyst. The patient was a 67-year-old postmenopausal woman with a growing cystic mass in the right adnexal region. Transvaginal ultrasonography revealed a cystic lesion 47 × 24 mm in diameter in the region of the right adnexa. Magnetic resonance imaging showed similar findings. During laparoscopy, the cystic lesion was found to be a distended appendix. Based on histologic examination following laparoscopic appendectomy, low-grade appendiceal mucinous neoplasia (LAMN) was diagnosed. This tumor should be considered in the differential diagnosis of right lower abdominal cysts.

Mucinous cystic tumor of the appendix in the differential diagnosis of an ovarian cyst: Case report