Background: Ovarian mucinous cystadenomas (MCAs) are very rare in adolescent females. These lesions can be misdiagnosed as hydatid cysts in endemic regions when seen on imaging. The cysts may wander after autoamputation and then can be diagnosed only with histology testing. Case: A 14-year-old adolescent female had a cyst that was wandering in her peritoneal cavity. This lesion appeared to be a hydatid cyst on imaging. The patient underwent a laparotomy with complete excision of the cyst. Results: Histopathology testing of the cyst revealed that it was a MCA of the ovary. The patient was discharged, as she was well, on the 8th postoperative day. Conclusions: Ovarian MCAs are very rare in adolescent females, with only 19 cases reported in previous literature. This type of lesion may mimic a hydatid cyst on imaging studies. Even if both ovaries may appear to be normal and are seen separately from the lesion, it is important to remember that, as a result of torsion, an ovarian mass may autoamputate and continue to grow by obtaining a blood supply from mesenteric vessels. (J GYNECOL SURG 32:64)
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