[Ovarian fibrothecoma: MR imaging findings and differential diagnosis]

We report the preoperative MR imaging of a 70 year old woman with a large tumor of the lower abdomen. MRI shows a extensively large mass with low signal in T2-weighted images. The origin of this tumor was suspected to be either the left ovary or the uterus. In the differential diagnosis a large subserous pedunculated leiomyoma or a low cellular, primarily benign ovarian tumor were considered.