2016 Volume 32 Issue 1 Pages 276-279
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.
