<unk>  is a group of tumors composed of variable proportions of Sertoli cells,<unk>  cells, and in the case of intermediate and poorly differentiated neoplasms, primitive gonadal stroma and sometimes heterologous elements.<unk>  (a sex-cord stromal tumor), is a testosterone-secreting ovarian tumor and is a member of the sex cord-stromal tumour group of ovarian and testicular cancers. The tumour occurs in early adulthood (not seen in newborn), is rare, comprising less than 1% of testicular tumours. While the tumour can occur at any age, it occurs most often in young adults. Recent studies have shown that many cases of<unk>  of the ovary are caused by germline mutations in the DICER1 gene. These hereditary cases tend to be younger, often have a multinodular thyroid goiter and there may be a personal or family history of other rare tumors such as pleuropulmonary blastoma, Wilms tumor and cervical rhabdomyosarcoma. Closely related terms include arrhenoblastoma and androblastoma. Both terms are classified under<unk>  in MeSH.
Sertoli–Leydig cell tumour
Granulosa cell tumour
Sertoli cell tumour
Sex cord–gonadal stromal tumour
Ovarian fibroma
Seminoma
Follicular cyst of ovary
Corpus luteum cyst