Description: A survey was performed with the assumption that the algorithm of used approaches is very important throughout the continuous diagnostics of asymptomatic liver echinococcosis. In the course of the 20-year experience (1986-2006) of the Department of General and Operative Surgery of the Medical University of Stara Zagora in diagnosing the disease, ultrasonography, radiography and computed tomography (CT) were performed in 127 patients. The different methods of diagnostics of the commonest symptoms of the diseases as well as the findings in complicatios, revealed during the operative treatment, are discussed. The hydatid cyst size was compared with the parasiteТs evaluative stages. The cystТs segmentary topography and the related risk of cystic echinococcosis were evaluated. The ultrasonography and CT scan findings were studied before and after therapy