ABSTRACT
Objective To study the diagnostic value of contrast-enhanced CT scan with split bolus for the ureleropelvic junction obstruction(UPJO) caused by aberrant vessel of kidney.Methods 52 patients with UPJO underwent contrast-enhanced CT scan with split bolus.The aberrant vessels and its origin as well as the relationship between aberrant vessels and UPJO were observed comparatively with the results of surgery.Results In 52 cases,CT showed UPJO caused by aberrant vessl of kidney in 14 cases,including accessory renal arteries in 10,ovarian artery originated from left renal artery in one,right accessory renal artery in one and gonad veins in 2.CT findings were corresponded to operations in all these 14 cases.The sensitivity and specificity of CT in evaluating UPJO were 100% respectively.Conclusion The UPJO caused by aberrant vessel of kidney can be diagnosed accurately by contrast-enhanced CT scan with split bolus,which can be offered for surgical treatment for UPJO.The patient's CT dose can be decreased with split bolus.