Table 1.

Localization of extragonadal germ cell tumors of 141 Klinefelter syndrome patients. Most germ cell tumors were found in the mediastinum, followed by the central nervous system

	Total patients (n)	% patients
Mediastinum	90	64
Cental Nervous system	23	16
Testis	15	11
Abdomen	13	9
Total	141