Objective. To demonstrate a case of a rare congenital liver disease, Caroli disease, characterized by segmental non-obstructive fibrocystic dilatation of the intrahepatic bile ducts. Main points. Caroli disease was first described by the French doctor Jacques Caroli in 1958. There are 2 types of Caroli disease: True type with dilation of the intrahepatic bile ducts, usually affecting one segment and with a tendency to form stones and develop cholangitis. The second type, which is combined with congenital hepatic fibrosis, polycystic kidney disease and is more common than the true type. When the disease is accompanied by CHF, it is called Caroli syndrome or Grumbach disease. It is important to remember about Crowley’s disease and include it in the differential range of diseases of the biliary tract and liver, such as cholangitis, secondary biliary cirrhosis, portal hypertension of unknown etiology, cholangiocarcinoma. Conclusion.The diagnosis of Caroli disease and Caroli syndrome is made using imaging studies. Treatment is largely supportive and should be individualized, with prognosis depending on the severity of the disease and the presence of concomitant renal dysfunction.