Testicular Germ Cell Neoplasia In Situ with Extratubular Extension

**Semantic type:** Neoplastic Process

**Definition:** A malignant neoplasm that arises from the testis and is characterized by the presence of large germ cells with abundant cytoplasm in the seminiferous tubules, associated with an invasive germ cell tumor in the adjacent tissues.

**Synonyms:** - Testicular Intratubular Germ Cell Neoplasia with Extratubular Extension