The bull's-eye sign: A hallmark radiologic sign of complete ureteropelvic junction disruption after blunt renal trauma

Complete ureteropelvic junction (UPJ) disruption is a rare finding after blunt abdominal trauma. High clinical suspicion and close attention to imaging studies are needed to avoidmissing a UPJ disruption during initial evaluation. In high grade renal trauma, the best imaging modality to detect collecting system injury and urinary extravasation is computed tomography (CT) scanwith delayed excretory phase imaging. Presence of urinary extravasation with lack of contrast material in the distal ureter may suggest a ureteral injury or complete UPJ disruption. We report a case of UPJ disruption with distinct radiologic finding of “bull's-eye” sign after blunt abdominal trauma, which was diagnosed and successfully repaired.