Photodynamic Diagnosis of Upper Tract Urothelial Carcinoma Using Fluorescence Endoscopy and Oral 5-ALA

This is a prospective, single-arm feasibility study investigating the use of 5-aminolevulinic acid (5-ALA, Gleolan) to enhance intraoperative tumor visualization in patients undergoing ureteroscopic resection for suspected upper tract urothelial carcinoma (UTUC). 5-ALA is an FDA-approved oral agent used in glioma surgery to promote fluorescence of malignant tissue under blue light. This study will evaluate whether similar visualization can be achieved in the upper urinary tract to aid in the identification and resection of UTUC. Up to 10 participants will be enrolled. Safety, technical feasibility, and tumor detection outcomes will be measured.