World Health Organization (WHO) classification of testicular tumors

• GCNIS
• Specific forms of intratubular germ cell neoplasia
• Gonadoblastoma

The germinoma family of tumors

• Seminoma

Nonseminomatous germ cell tumors

• Embryonal carcinoma
• Yolk sac tumor, postpubertal type
• Choriocarcinoma
• Placental site trophoblastic tumor
• Epithelioid trophoblastic tumor
• Teratoma, postpubertal type
• Teratoma with somatic-type malignancy

Mixed germ cell tumors of the testis

• Mixed germ cell tumors

Germ cell tumors of unknown type

• Regressed germ cell tumors

• Spermatocytic tumor
• Teratoma, prepubertal-type
• Yolk sac tumour, prepubertal type
• Testicular neuroendocrine tumor, prepubertal type
• Mixed teratoma and yolk sac tumor, prepubertal type

• Leydig cell tumor

Sertoli cell tumor

• Sertoli cell tumor
• Large cell calcifying Sertoli cell tumor

Granulosa cell tumor

• Adult granulosa cell tumor
• Juvenile granulosa cell tumor

The fibroma thecoma family of tumors

• Tumors in the fibroma thecoma group

Mixed and other sex cord-stromal tumors

• Mixed sex cord-stromal tumor
• Signet ring stromal tumor
• Myoid gonadal stromal tumor
• Sex cord-stromal tumor NOS