[A case of a 47 years old hydatid cyst of the liver]

This is a presentation of a clinical observation of a hydatid cyst of the liver, accidentally diagnosed 47 years before the first complains. There were no calcifications on the X-rays before the operation, besides the long duration of its existence. There were no complications before the surgery, and the operation and postoperative period were smooth. The case is presented, mainly because of its extraordinary long period of existence of the parasite in the liver, without any symptoms. This shows, that the processes of aging of the hydatid cyst in the liver, under certain circumstances, can be very slow and asymptomatic. Two of these conditions are intrahepatic (intraparenchymal) localization, and the lack of adjacent large biliary ducts.