[Human hydatidosis: advances and report of four paediatric cases with unusual presentation].

Human hydatid disease due to Echinococcus granulosus is frequently observed in Italy, especially in the central and southern areas and on the islands. In the last twenty years some major advances in the field of epidemiology as well as diagnostic and therapeutical approaches have changed our knowledge of this disease. In Italy, localization in the liver, kidney or peritoneum accounts for about 95% of cases. The authors describe four paediatric cases with unusual localization (kidney and muscle), highlighting difficulties in the diagnosis.