Choledochoduodenostomy was performed in 100 patients for calculus related disease of the common bile duct. There were no significant early or late complications of the anastomotic procedure. The 3 per cent mortality was related to antecedent advanced liver disease in two instances and, in one instance, to intra-abdominal sepsis. The surgical bypass has the advantage of circumventing the retained stone problem or the sequelae of benign obstructive disease in the distal part of the choledochus. It permits postoperative roentgenographic and endoscopic evaluation of the anastomotic site. Cholangitis, blind segment disability and malfunction have not been seen with these indications and this technique. When the common bile duct is at least 1.4 centimeters wide, primary or secondary choledochoduodenostomy with a wide anastomosis has significant advantages over T-tube intubation in the therapeutic and prophylactic management of choledocholithiasis.