Invasive Poorly Differentiated Urothelial Carcinoma

**Semantic type:** Neoplastic Process

**Definition:** Invasive urothelial carcinoma that lacks the morphological features indicating urothelial origin. Immunohistochemical studies are required to demonstrate the urothelial lineage in these tumors.

**Synonyms:** - Poorly Differentiated Urothelial Carcinoma