ERCP-related perforation is a serious complication. Identifying clinical factors that influence hospital course may lead to better targeted clinical intervention and improve patient outcome. AIM: To identify the clinical factors that affect outcome in patients who suffered an ERCP-related perforation. Methods: IRB-approved, retrospective analysis of ERCP-related perforations at our institution from January 2003 to November 2007. Patient demographics, procedural factors, laboratory and radiographic imaging results, and post-ERCP complications were recorded and analyzed using length of stay (LOS), surgical intervention, and readmission rates as primary endpoints. All procedures were performed by ERCP experts. Results: 2759 ERCP procedures were performed during this time period, and 30 (1.1%) patients (21 Females, mean age 47.4 years) suffered an ERCP-related perforation. Indications for ERCP were: SOD (40.0%), pancreatitis (16.7%), stone/stricture (13.3%), ampullary mass (10.0%), pancreas divisum (6.7%), PSC, abdominal pain, biloma, dilated pancreatic duct (3.3% each). The odds of perforation were higher (OR 40, CI 18-87) in SOD patients, as compared to non-SOD patients. 25 patients underwent endoscopic sphincterotomy and 16 patients had an endoprosthesis placed. 96.7% (29/30) of the perforations were detected within 72 hours; 85.7% were detected by CT. A delay in perforation diagnosis significantly increased the mean LOS (7.0 days if detected at ERCP vs. 15.7 days if detected within 24 hours vs. 23.0 days if detected between 24-72 hours; p = 0.048), as did the presence or development of one or more of the following clinical features: ascites, abscess, fluid collection, pneumothorax, pneumomediastinum, pleural effusion, thrombophlebitis. In 13 patients who had concomitant post-ERCP pancreatitis, the odds of developing a retroperitoneal fluid collection (OR 13.2; p = 0.006) was higher than in patients with perforation alone; however, there was no increase in LOS or need for surgical intervention. Patients who underwent surgical intervention (9/30) had a significantly longer LOS (37.7 days vs. 11.1 days; p = 0.006) as compared to patients managed non-operatively, and surgical patients were more likely to be re-admitted (p < 0.03). There was no mortality in this cohort. Conclusions: Early diagnosis of the perforation and non-operative management was associated with shorter hospitalization. LOS is increased with the development of several clinical features. Surgical patients had higher readmission rates compared to non-operative patients. This is the first study to identify clinical factors associated with patient outcome after suffering an ERCP-related perforation.