Although many papers concerning th eultrasonographic findings of liver abscess have been appeared, there is a few literatures for the analysis of its echogenic patterns. Twenty-nine cases of surgically proven liver abscess were studied by ultrasonography in our hospital during recent 3 years. 1. Ultrasonography permitted correct diagnosis in 26 of 29 patients with sensitivity 90%. 2. All the 7 cases of amebic abscess were single lesions and 6 cases of them were distributed in the right lobe of liver, while pyogenic abscesses showed single or multiple lesions. It was very difficult to distinguish pyogenic abscesses from amebic abscess in case of single lesion. 3. It was impossible to differentiate pyogenic abscess from amebic abscess by the echopattern of abscess wall and internal echogeneity. 4. The wall of obscess was ill-defined in the majority, and internal echogenecty of abscess was variable although weak internal echogenecity was more common. 5. The echopattern of abscess was gradually converted to echolucent or hypoechoic area with weak internal echoes in following up study. 6. Clinical findings and ultrasonic findings should be carefully analysed to secure correct diagnosis if there ia any possibility of co-existing necrotizing metastatic lesion.