Results of examination and treatment in 256 patients, suffering an acute ileus (AI), were analyzed. Differentiation—diagnostic program was elaborated, what have permitted to establish a correct diagnosis in 98.4% patients. Higher informativity of ultrasonograph' ic investigation, permitting to verify the diagnosis on early stage of the disease and to estimate conservative treatment efficacy, accordingly, in 94.4 and 87.8% patients, was established while doing comparative analysis of ultrasonographic and radiological diag' nostic methods.