Although ultrasound is usually the imaging modality of choice to identify hydronephrosis secondary to obstruction, it may be unreliable in some cases of acute obstruction. We describe one such case.
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9. Deyoe LA, Cronan JJ, Breslaw BH, Ridlen MS: New techniques of ultrasound and color Doppler in the prospective evaluation of acute renal obstruction. Do they replace the intravenous urogram?Abdom Imaging1995;20:58-63.