This article presents a cystoscopy and right ureteroscopy with aborted biopsy and laser ablation due to ureteral narrowing. The procedure was initiated following an incidental finding on CT of a right renal mass, suspicious for transitional cell carcinoma. The video outlines systematic endoscopic evaluation of the bladder and upper urinary tract, guidewire placement, retrograde pyelogram, and flexible ureteroscope advancement attempts. Due to anatomical limitations, the procedure was modified to place a ureteral stent using the Seldinger technique. This case highlights surgical adaptability, staged intervention planning, and the importance of visual and tactile guidance in endourological access.