The article presents results of treatment of 63 patients with cholecystocholedocholithiasis from a minilaparotomic access without a preliminary endoscopic papillosphincterotomy (EPST). The method of revision of the common bile duct is described and the diagnostic algorithm after the detection of impaired patency of its terminal part. Stenosis of the major duodenal papilla (MDP) was diagnosed in 7 patients (11.1%) in whom the operation was followed by successful EPST. Based on the data of personal investigations and analysis of literature the authors made a conclusion that preoperative diagnostics of stenosis of MDP was problematical. This diagnosis must be made using a complex of intraoperative diagnostic methods among which the probe of MDP is of main significance.