Some investigators suggest that this distribution arises as a consequence of abnormal migration of<unk>  cells during embryogenesis. Others hypothesize a widespread distribution of<unk>  cells to multiple sites during normal embryogenesis, with these cells conveying genetic information or providing regulatory functions at somatic sites. Extragonadal<unk> s were thought initially to be isolated metastases from an undetected primary tumor in a gonad, but many<unk> s are now known to be congenital and originate outside the gonads. The most notable of these is sacrococcygeal teratoma, the single most common tumor diagnosed in babies at birth. Of all anterior mediastinal tumors, 15–20% are<unk> s of which about 50% are benign teratomas. Ovarian teratomas may be associated with anti-NMDA receptor encephalitis.
Germ cell tumor
Gonadoblastoma
Brown tumor
Ovarian germ cell tumors
Embryoma
Granulosa cell tumour
Neuroma
Endolymphatic sac tumor