s / Urological Science 26 (2015) S50eS81 S80 Results: There were 6 patients in intraperitoneal group and 6 patients in extraperitoenal group with a mean age of 44.5 and 43.2 in each group. Mechanisms of injury were blunt abdominal trauma and pelvic fracture. There was no significant difference between the IBP and EBP groups with regard to age, mechanism of injury, baseline creatinine and blood urea nitrogen (BUN). The biochemical parameters were found to be within normal range in the EBP group, whereas significantly higher levels of creatinine, BUN were noted in IBP group (p 1⁄4 0.01 and 0.06) Conclusion: In patients with intraperitoneal bladder perforation, progressive urinary ascites with the development of abdominal discomfort will soon follow. This is because the excretion function of the kidney greatly exceeds the subdiaphragmatic lymph flow, which provides the principal means for the removal of intraperitoneal fluid. Stasis of urine in the peritoneal cavity allows for reversed intraperitoneal autodialysis to take place. The higher concentration of creatinine and nitrogenous waste products in the urine as compared to plasma allows for concentration gradient diffusion when the urine is in contact with the peritoneum, functioning as a semipermeable membrane. As illustrated in this study, the patient's serum creatinine and BUN will rise. But because the glomerular filtration rate is intact, the raise of serum creatinine is referred to as pseudorenal failure. When pseudorenal failure based on reversed autodialysis is suspected, the intraperitoneal bladder perforation should be considered in differential diagnosis. Further study such as cystography is warranted in these patient and it can identifies a bladder tear by documenting intraperitoneal contrast leakage. patients presenting with IBP are more likely to present with significantly higher levels of creatinine and BUN compared with the patients with EBP. Biochemical alterations can be used to differentiate traumatic IBP and EBP with subtle physical examination and radiological findings. NDP115: RHABDOMYOLYSIS AND ACUTE RENAL FAILURE FOLLOWING TRANSURETHRAL RESECTION OF BLADDER TUMOR Jen-Hao Cheng, Cheng-Che Chen, Yen-Chuan Ou. Divisions of Urology, Department of Surgery, Taichung Veterans General Hospital, Taichung,