Table 1.

Classification of intratesticular tumors in children.

Tumoral Group	Histotypes	Prevalence (%)
Benign Germ-cell tumor	Mature teratoma and dermoid cysts	40–50%
Non seminomatous malignant germ-cell tumor	Immature teratoma	rare
	Yolk sac tumor	8–30% (<2 years)
	Choriocarcinoma	rare
	Embryonal carcinoma	rare
	Mixed non seminomatous malignant germ-cell tumor	More frequent in post-pubertal patients
Seminomatous malignant germ-cell tumor	Seminoma	Exceptional in children
Sex-cord stromal tumors	Leydig-cell tumor	5%
	Sertoli-cell tumor	<1%
	Juvenile granulosa cell tumor	<5%
	Mixed sex-cord stromal tumor	<5%
Pseudo-tumors	Epidermoid cyst	10–15%
	Testicular adrenal rest tumor	30–50% in the context of congenital adrenal hyperplasia
Secondary testicular involvement of lymphoma or leukemia		1–7%
Secondary involvement of primary solid tumor		<1%
Others		<1%