Microcystic meningioma arising in a mixed germ cell tumor of the testis - A case report

We report a case of a microcystic variant of meningioma arising in a mixed germ cell tumor of the testis composed predominantly of mature and immature teratoma with elements of seminoma and embryonal carcinoma. We believe thi s is the first such case of a meningioma arising in a teratoma within a gon adal or extragonadal site. The meningiomatous component showed positive imm unohistochemical staining for epithelial membrane antigen and a lack, of st aining for cytokeratin, factor VIII, CD31, and alpha-fetoprotein. Recogniti on of a non-germ cell tumor arising in the setting of a teratoma in the tes tis may be prognostically important depending on the nature of the nongerm cell component and whether it has spread beyond the testis.