Lymphoepithelioma-like carcinoma of urinary bladder - a rare subtype of urothelial carcinoma: a series of 12 cases.

Lymphoepithelioma-like carcinoma (LELCa) is a rare and aggressive subtype of urothelial carcinoma. This study presents a series of 12 cases of LELCa of the urinary bladder, highlighting its clinical and pathological features with treatment related details. The majority of cases presented with advanced-stage disease, often mixed with conventional urothelial carcinoma. Histologically, LELCa is characterized by sheets of undifferentiated tumor cells with prominent nucleoli in a syncytial growth pattern, accompanied by a dense lymphocytic infiltrate. Immunohistochemistry aids in confirming the epithelial nature of the tumor cells. Treatment strategies for LELCa are evolving. While radical cystectomy remains the standard treatment for advanced-stage disease, a multimodal approach, including chemotherapy and radiation therapy, may be considered, especially in cases with pure or predominant LELCa histology.