[Hepatic and extrahepatic alveolar echinococcosis: CT and MR imaging features].

To illustrate the CT and MR imaging features of alveolar echinococcosis, a rare disease that is endemic in the northeast of France. Hepatic and extrahepatic manifestations are presented. Fibrous and necrotic features are demonstrated on MR. Calcifications are demonstrated on CT. Accurate imaging diagnosis will exclude tumors (cholangiocarcinoma, cystadenoma, fibrous metastases) and avoid unnecessary biopsy.