Familial dysgerminoma associated with 46, XX pure gonadal dysgenesis.

Although the occurrence of pure gonadal dysgenesis PGD is usually sporadic and nonfamilial, here we present 3 sisters with 46, XX PGD, who are born from a first cousin marriage. Review of their family pedigree is compatible with autosomal recessive inheritance. Surprisingly, 2 of these sisters developed ovarian tumors. Both showed the pathological result of dysgerminoma with syncytiotrophoblastic giant cells. These 2 cases are examples of tumorigenesis in PGD without an identifiable Y chromosome. Therefore, malignant degeneration of the streak gonads should be considered in the patients with 46, XX PGD.