Patients with 46,XY complete gonadal dysgenesis (Swyer syndrome) are characterized by the presence of female internal genital tract and bilateral streak gonads in a phenotypic female. These women have a high risk of developing rare type II malignant germ cell tumors. We report a rare case of a 33-year-old 46,XY female patient, who presented with an adnexal mass suspected for dysgerminoma, with a novel mutation of the sex-determining region on the Y chromosome consisting in the variant c.301C> G (p.L101V). Considering that effective screening is not available and the high risk of developing malignant neoplasm, prophylactic gonadectomy is mandatory.
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