Inclusion Criteria:  adults (from 18 to 75 years old) suffering from a gall bladder disease with valid indication for laparoscopic cholecystectomy (e.g., calculus gall bladder with cholecystitis) accepted to participate in the study.  Exclusion Criteria:  Patients with history of previous biliary surgery Patients with abdominal malignancy Patients with advanced chronic liver disease pregnant women