Single and multiple pyogenic liver abscesses: etiology, clinical course, and outcome.

BACKGROUND Pyogenic liver abscesses are uncommon but they still carry a high mortality rate when encountered. This study was undertaken to evaluate the differences in the clinical behaviour of patients with single and multiple abscesses. METHODS From January 1985 to December 1997, 133 patients with this disease were treated in the surgical departments of five hospitals, 97 had a single abscess and 36 had multiple abscesses. Clinical features, methods of treatment, and outcome were assessed and compared in both types of abscesses. RESULTS A biliary origin from ascending cholangitis was most frequently found in multiple abscesses (p = 0.007). Mean age and duration of symptoms were higher in multiple lesions (p = 0.03 and p = 0.001). High levels of alkaline phosphatase were more frequently seen in multiple abscesses than in solitary ones (p = 0.02). They were both most frequently located on the right side. Antibiotic therapy alone was most frequently used in multiple abscesses (p = 0.01). Mortality rate was also higher in this type of patients (p = 0.01). The abscess-related morbidity rate was higher in multiple lesions as well but the statistical difference was not significant. CONCLUSIONS These results suggest that multiple liver abscesses comprise a disease of biliary origin, higher age, longer symptomatic periods, and also higher mortality rate than in single abscess.