Endoscopic retrograde cholangiopancreatography in Echinococcus (hydatid) cysts of the liver.

Endoscopic retrograde cholangiopancreatography (ERCP) was carried out on 19 patients with hydatid cyst of the liver, either before or after operation. Cholangiographic findings included biliary tract obstruction in 8 cases, intrinsic compression in 4 cases, laminated membranes or daughter cysts in the biliary tree in 3 cases, perforation into the biliary tract in 2 cases, stricture in the biliary ductal system in 1 case, and biliary fistula in the remaining case. Biliary tract obstruction was secondary to chemical cholangitis by formalin in 2 patients. ERCP is a useful procedure in patients with suspected intrabiliary rupture or when symptoms occur after surgical removal of the cyst.