In order to determine sonographic characteristics of renal tuberculosis, we retrosp to ectively collected 27 cases during a 5- year period. Infected kidneys showed large size(52%) and lobulating contour(76%). In 19 cases of increased parenchymal echogenicity, most of them (16 cases0 showed decreased parenchymal thickness. We divided hydronephrotic patterns into 4 categories : predominant calyceal dilatation with mild or no pelvic dilatation(67%), focal calyectasis without pelvic dilation (15%), parenchymal cavitation without hydronephrosis (11%) and proportional hydronephrosis with calyceal deformity (7%). Our findings suggest that disproportional hydronephrosis would be the characteristic finding of renal tuberculosis.