Multidetector computed tomography arteriography in the preoperative assessment of patients with ureteropelvic junction obstruction.

First Prize (Tie): Hemorrhage Following Percutaneous Renal Surgery: Characterization of Angiographic Findings

“…Currently, computed tomography arteriography is able to accurately identify the presence and location of the lower pole and aberrant vessels. 13 Multiple vascular injuries can also be encountered as the source of bleeding. In this series 10 patients (17.5%) had more than one angiographic finding, which is comparable to rates seen in previous studies.…”

Accessory or additional renal arteries show no relevant effects on the width of the upper urinary tract: a 64-slice multidetector CT study in 1072 patients with 2132 kidneys

“…Of these, 473 were female (44.1%) and 599 were male (55.9%) with an average age of 59.5¡17.6 years (range 1.7-99.4 years). Of these patients, 3.1% (n532) were children younger than 18 years. The indications for the CT scans were tumours for 288 (26.8%) of the patients, vascular pathologies for 221 (20.6%), pathologies of the liver for 213 (19.9%), haemorrhaging for 33 (3.1%) and various other causes for 317 (29.6%).…”

“…Although there are no studies of this to date, crossing the UPJ by an aberrant crossing vessel is considered the most important [2] of the extrinsic factors [3]. Crossing vessels, which are thought to cause from 40% to over 50% of the extrinsic UPJ obstructions in adults [4,5], are located ventral more often than dorsal to the UPJ.…”

“…Be that as it may, to prevent bleeding complications it is necessary to be familiar with the vascular situation around the UPJ prior to the procedure [3,[16][17][18]. CT angiography is used for this purpose, as it is highly accurate, quick to perform and shows all relevant anatomical structures in relation to one another [3,19,20].…”

Normal Variant and Congenital Anomalies

“…The proximal dilatation only above UPJ confi rms the obstructive point as UPJ. Congenital UPJ obstruction could be due to a dynamic segment at UPJ or less commonly by extrinsic compressing vessels or fi brotic bands at UPJ [ 13 ]. In the presence of severe UPJ obstruction, contrast opacifi cation of ipsilateral renal pelvicalyceal system could be delayed and faint by impaired renal function.…”