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Comparison of Tuberculous and Pyogenic Epididymal Abscesses

Clinical, Gray-Scale Sonographic, and Color Doppler Sonographic Features

¹ Department of Radiology, Gachon Medical College, Gil Medical Center, 1198, Guwol-Dong, Namdong-Gu, Inchon, 405-760, South Korea.
² Department of Urology, Gachon Medical College Gil Medical Center, Inchon, 405-760, South Korea.
³ Department of Preventive Medicine, Gachon Medical College, Gil Medical Center, Inchon, 405-760, South Korea.

OBJECTIVE. The purpose of this study was to evaluate the capability of clinical, gray-scale sonographic, and color Doppler sonographic features for differentiating tuberculous and pyogenic epididymal abscesses.

MATERIALS AND METHODS. Retrospective analysis was performed in 10 cases of tuberculous epididymal abscess and in 13 cases of pyogenic epididymal abscess. The following clinical, gray-scale sonographic, and color Doppler sonographic features were analyzed: patient's age; duration of symptoms; scrotal tenderness; presence of sinus tract; concurrent tuberculosis in other organs; location, size, and echogenicity of the abscess; hyperechoic rim; testicular involvement; hydrocele; and blood flow in the epididymal lesion.

RESULTS. Tuberculous epididymal abscess had a longer duration of symptoms (p = 0.0001) and a lower frequency of scrotal tenderness (p = 0.0048) than pyogenic epididymal abscess. The size of the abscess was larger in tuberculous epididymal abscess than in pyogenic epididymal abscess (p = 0.0002). The degree of blood flow in the peripheral portion of the abscess was lower in tuberculous epididymal abscess (p = 0.001). The patient's age, location and echogeninicity of the abscess, presence of sinus tract, hyperechoic rim, testicular involvement, and hydrocele did not differ between the tuberculous and pyogenic epididymal abscesses.

CONCLUSION. Some clinical findings, gray-scale sonography, and color Doppler sonography were useful in differentiating tuberculous epididymal abscess from pyogenic epididymal abscess. The presence of long-term scrotal swelling without tenderness and a lower degree of blood flow in the peripheral portion of a large abscess are suggestive of tuberculous epididymal abscess.

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