Congenital multiple cystic dilatation of the intrahepatic biliary ducts (two cases with simple type of Caroli's disease).

Two cases of Caroli's diseases (simple type) precisely diagnosed prior to the operation by the direct cholangiography, endoscopic retrograde cholangiography, and percutaneous transhepatic cholangiography, were reported. They both had a long cystic duct, and association of cystic lesions of bilateral kidneys was revealed in one of them. Excessive biliary output had been observed postoperatively in both of them. A cholecystectomy and choledochodrainage successfully gave rise to favourable results in both cases reported.