<unk>  (GCNIS) represents the precursor lesion for many types of testicular<unk> <unk>  tumors. As the name suggests, it represents a neoplastic process of<unk> <unk> s that is confined to the spermatogonial niche. The term GCNIS was introduced with the 2016 edition of the WHO classification of urological tumours. GCNIS more accurate describes the lesion as it arises between the basement membrane and Sertoli<unk> s (the<unk> s that 'nurse' the developing<unk> <unk> . The common, unspecified variant of the entity was once considered to be a carcinoma in situ, although the term "carcinoma in situ" is now largely historical as it is not an accurate description of the process.
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