Purpose: To compare the differences between renal abscess and perirenal abscess in causes, clinical courses, treatment method and their outcome.
Material and methods: From January 2001 to July 2008, we retrospectively reviewed the medical records of 66 patients who were diagnosed and treated for renal and perirenal abscess at our center. Seventy-one kidneys were involved. Renal and perirenal abscess were 40 and 31 cases, respectively. We divided 2 groups and analyzed patients characteristics, symptoms, underlying diseases, pathogenic organisms, abscess size, treatment duration, and clinical outcome.
Results: The average age of the patients was 47.9 years and female was predominant (M:F=1:2.9) (p=0.0009). Diabetes mellitus (33.8%), liver cirrhosis (19.7%) and kidney diseases (19.7%) were the most common predisposing factors. Diabetes mellitus was more frequently combined with perirenal abscess group (p=0.0419). The symptom-diagnosis duration and hospitalized period of perirenal abscess group were longer than those of renal abscess group (13.5±14.9 vs 8.3±9.9days and 26.5±21.1 vs 13.5±14.9days; p=0.0823 and 0.0005, respectively). Escherichia coli, Staphylococcus aureus, Klebsiella pneumonia were common pathogens in two group. The mean size of the renal and perirenal abscess were 2.85cm (range 1~7.7) and 5.84cm (range 1.5~13) (p<0.0001). Most of the renal abscesses received only antimicrobial agents (75%) and were cured on discharge. However, 22 cases in 31 perirenal abscess (71%) were needed an interventional treatment: needle aspiration 6 (19.4%), percutaneous drainage 15 (45.2%), open drainage 1 (3.2%), nephrectomy 1 (3.2%). Mortalities of renal and perirenal abscess were 2.7% (1/37) and 13.8% (4/29) (p=0.222), respectively.
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