Purpose
Ovarian mucinous cystadenocarcinoma is rare in adolescent population and reports are scarce in Korea. The aim of this study was to identify the clinicopathologic features and prognosis of adolescent ovarian mucinous cystadenocarcinoma.
Methods
Adolescent patients who were diagnosed with ovarian mucinous cystadenocarcinoma between 2001 and 2012 in Seoul National University Children Hospital were included. We retrospectively reviewed medical records of demographics, preoperative evaluation, tumor characteristics, and prognosis of patients.
Results
Among 5 patients, none of them reported family history of cancer or underlying disease relevant to malignancy. The median follow-up period was 13.3 years. The mean age at the time of diagnosis was 15.4 years. The mean size of the tumor was 26 cm. Only one patient had neoadjuvant chemotherapy. All patients underwent surgical treatment. One patient underwent total abdominal hysterectomy and bilateral salpingo-oophorectomy for cytoreductive surgery and 4 patients underwent fertility sparing surgery. Three patients had platinum-based adjuvant chemotherapy. One patient suffered recurrence and eventual death and 4 patients are in disease free survival status.
Conclusion
Although ovarian mucinous cystadenocarcinoma in adolescent is rare, we should suspect the presence of it in case of adolescent intraabdominal large mass. As adolescent patients undergo fertility preserving surgery, serial and careful follow-up is necessary.

Diverticular bleeding and gastric heterotopia (GHT) in the proximal lower gastrointestinal tract are rare in adolescents. Here, we report a case of cecal diverticular bleeding associated with GHT. A 17-year-old adolescent boy was discharged after treatment for cecal diverticular bleeding. Subsequently, he visited the hospital due to an episode of hematochezia and sustained pain in the right lower abdomen. A colon study showed a diverticulum causing external compression in the cecum. His hemoglobin level was 7.2 g/dL. Abdominopelvic computed tomography showed thickening of the ascending and transverse colon, suggesting non-specific colitis. Single-incision laparoscopic ileocecal resection was performed. Pathologic findings demonstrated congenital diverticulum with GHT in the cecum, and an ulcer with perforation in the cecal area. In cases of hematochezia among adolescents, clinicians should be aware of the possibility of rare diseases such as GHT.