“…In the majority of the cases that tumor represents a germinoma (dysgerminoma and seminoma, respectively) (Scully, 1953;Scully, 1970). The tumors almost always arise in a dysgenetic gonad carrying an Y-chromosome (Scully, 1970;Lukusa et al, 1991;Rutgers, 1991;Berkovitz et al, 1991;Slowikowska-Hilczer et al, 2001;2003) or in patients with chromosomal mosaicism and other chromosomal aberrations (Fukamatsu et al, 1990; Barbosa et al, 1995;Hong et al, 1995;Obata et al 1995;Hussong et al, 1997;McDonald et al, 1997;Iezzoni et al, 1997). Here, we report clinical, endocrinological, and immunohistochemical findings in five patients with 46,XY gonadal dysgenesis who had developed gonadoblastomas.…”