Desmoplastic Medulloblastoma Arising From an Ovarian Teratoma: A Case Report and Review of the Literature.

The primary neuroectodermal tumor of the ovary is extremely rare, and it manifests in 3 forms: differentiated, primitive, and anaplastic. The medulloblastoma belongs to the subgroup of primitive neuroectodermal tumor of the ovary. Only 3 cases of ovarian medulloblastoma have been reported in the literature, and all of them are presented without information about the specific pathological subtype. We present the fourth case of a 26-year-old woman who presented with abdominal fullness for months. Ultrasound exam showed a right adnexal mass with cystic feature and foci solid components. A partial oophorectomy was performed, and the mass was a desmoplastic medulloblastoma arising from an ovarian teratoma.