Dr. Doizi of the Université Pierre et Curie in Paris published a study comparing the efficacy and safety of ureteral chondroscopy in the treatment of kidney stones in patients with different BMIs. Dr. Doizi conducted a single-center retrospective study of patients who underwent ureteroscopic lithotripsy between 2006 and 2008 based on BMI. The analysis compared the success of the procedure in obese patients (BMI ≥30 kg/m2) with normal weight patients (BMI <25 kg/m 2. Patients with a BMI ≥40 kg/m2 were defined as morbidly obese patients (a subgroup of obese patients). Patients were considered to have a successful procedure when they had stone clearance (no stones or residual stones ≤2 mm) as assessed by renal ureterocystography and ultrasonography (only for normal weight patients with radiographically unrevealing stones) or CT scan 3 months after surgery. A total of 327 procedures were included in the study, including 97 ureteral flexible lithotripsy procedures in obese patients (including 14 procedures in 13 patients with morbid obesity) and 230 ureterorenoscopic lithotripsy procedures in 188 standard weight patients. The success rate of the procedures was 67.4% versus 68% in normal weight versus obese patients, respectively. p=0.91 (71.4% in the morbidly obese patient subgroup). In both the normal weight group and the obese group, the surgical success rate decreased with increasing stone size. There were no statistical differences in surgical success rates except for stone location and stone size (<10,>20 mm). Postoperative morbidity was similar in both groups, at 2.44%, and Dr. Doizi concluded that the outcomes of ureteroscopic lithotripsy were similar and the morbidity rates were similar in patients with normal weight groups, obese groups, and even morbidly obese patients, regardless of stone size and location. The efficacy and safety of ureteral chondroscopy is less affected by weight than shock wave lithotripsy and percutaneous nephrolithotripsy.