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

Participants will receive a single oral dose of 5-aminolevulinic acid (20 mg/kg) approximately 2 to 4 hours prior to surgery. The goal is to evaluate the feasibility of using fluorescence cystoscopy with blue light to improve tumor detection and visualization during ureteroscopic resection of upper tract urothelial carcinoma.