Testicular cancers are either seminomas or nonseminomas, depending on where the cancer started. Other types of cancer that arise in the testicles are rare.
Seminomas may be one of three types: classic, anaplastic, or spermatocytic.
Types of nonseminomas include choriocarcinoma, embryonal carcinoma, teratoma and yolk sac tumors.
Testicular tumors may contain both seminoma and nonseminoma cells.