Testicular Yolk Sac Tumor, Endodermal Sinus/Perivascular Pattern

**Semantic type:** Neoplastic Process

**Definition:** A yolk sac tumor that arises from the testis and is characterized by the presence of connective tissue stalks that contain a blood vessel and are lined by cells with clear cytoplasm and prominent nucleoli.

**Synonyms:** - Testicular Yolk Sac Tumor, Endodermal Sinus Pattern