Bilateral synchronous germ cell tumors.

We present cases 38 and 39 of primary bilateral synchronous germ cell tumors of the testes and review the literature. Seminoma (42 of 68 cases) is the most common cell type reported, and bilateral seminoma is the most common cell type combination (19 of 34 cases). The incidence of cryptorchidism is not increased in patients with bilateral synchronous germ cell tumors. A tendency towards occurrence in older patients is noted. The stage of disease at presentation appears to be no worse than that for unilateral disease.