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The prognosis for patients with alveolar echinococcosis of the liver (AEL) is excellent when the lesion is completely resected. Early detection of the disease and subsequent resection of the lesion are thus indispensable; however, the usefulness of screening systems is now controversial. This study was designed to compare screened and non-screened patients according to stage classification and to re-evaluate the effect of screening. We studied a total of 82 patients (63 screened and 19 non-screened). The stage classification showed a significant intergroup difference ( P<0.002). The largest tumors ranged from 30 to 100 mm, and there was a significant intergroup difference ( P<0.0014). Ultrasonography showed even small lesions in the screened patients. The complete resection rate was 74.6% for the screened patients, and 21.1% for the nonscreened patients, showing a significant difference ( P<0.0001). The rate of unresectable lesions was higher in the non-screened patients (32%) than in the screened patients (11%), showing a significant difference ( P<0.04). The present screening system contributes to early detection and subsequent resection of AEL, leading to a better outcome. [ABSTRACT FROM AUTHOR]