The World Health Organization classification of testicular tumours subdivides ITGCN into (1) a more common, unspecified type (ITGCNU), and (2) other specific subtypes. The most common specific subtypes are intratubular embryonal carcinoma and intratubular seminoma.
Germ cell neoplasia in situ
In situ lymphoid neoplasia
Surface epithelial-stromal tumor
Sclerosing polycystic adenosis
Keratin implantation cyst
Microcystic adnexal carcinoma
Ductal carcinoma in situ
Intraepithelial neoplasia