Massive ovarian edema is considered a non-neoplastic lesion characterized by a tumor-like enlargement of one or occasionally both ovaries secondary to an accumulation of edema fluid within the stroma. It is an uncommon entity that usually leads to oophorectomy as an unnecessary treatment in children, adolescents and young women. A diagnostic wedge resection with subsequent frozen section is essential. A definitive diagnosis of massive ovarian edema can not be made on preoperative imaging. In this article a case of massive ovarian edema in a 15-year-old female thought to be a solid neoplasm in the preoperative period is described.