Bladder Flat Urothelial Carcinoma In Situ

**Semantic type:** Neoplastic Process

**Definition:** An intraepithelial urothelial carcinoma that arises from the bladder as a flat lesion not associated with papillary structures formation.

**Synonyms:** - Bladder Flat Intraepithelial Lesion - Flat Intraepithelial Lesion of the Bladder - Flat Intraepithelial Lesion of the Urinary Bladder - Urinary Bladder Flat Intraepithelial Lesion