We present the first reported cases of germinoma occurring in siblings
of different genders. One tumor occurred in the left basal ganglia of
a 7-year-old boy and the other in the suprasellar region of his 9-yea
r-old sister. Both tumors were diagnosed as germinoma of two-cell patt
ern based on light and electron microscopic studies. Possible genetic
factors responsible for this phenomenon are discussed.