Classification of Intratubular Germ Cell Neoplasia.
 
  Intratubular germ cell neoplasia, unclassified
  Intratubular germ cell neoplasia, unclassified, with extratubular extension (early seminoma)
  Intratubular seminoma
 
  Classic
  Spermatocytic
  Intratubular embryonal carcinoma
  Intratubular yolk sac tumor
  Intratubular germ cell neoplasia, other forms