Giant serous cystadenoma arising from an accessory ovary in a morbidly obese 11-year-old girl: a case report.

Introduction: Ectopic ovarian tissue is an unusual entity, especially if it is an isolated finding thought to be of embryological origin.

Case Presentation: An 11-year-old, morbidly obese female presented with left flank pain, nausea, and irregular menses. Various diagnostic procedures suggested a large ovarian cyst, and surgical resection was performed.