[An evaluation of orthotopic ileal neobladders by dynamic digital urography]

To report on the diagnostic capabilities of dynamic digital urography in the evaluation of orthotopic ileal neobladders.

Ten male patients (aged 61.3 +/- 14.7 years) with orthotopic ileal neobladder (4 Studer, 4 Camey type II with spiralized ileal segment and 2 classic Camey type II) underwent dynamic digital urography using an angiographic unit (Philips DVI/ARC-A). Eight patients were asymptomatic and two presented mild nycturia. All patients should have undergone follow-up conventional urography, which was replaced, for the purposes of our study, by dynamic digital urography. The intestinal cleansing regimen usual for the double contrast barium enema was used in all the patients. Ninety mL of a nonionic iodinated contrast agent were administered i.v. with an automatic injector. After precontrast mask images, two postcontrast sequences were acquired 15 s and 30 min after the injection (each made of 20 images acquired every 10 seconds). Postprocessing consisted of digital image subtraction and videorecording.

Renal pelvis and calyceal systems were well visualized in 18/20 excretory systems. Eighteen of 20 ureters were visualized completely up to the ureteral jet, and two were only partially visualized. Calyceal, pyelic and ureteral enlargement with ureteral kinking were observed in a patient with classic Camey type II. High motility was seen in 11 ureters, moderate in 5 and mild in 4. The orthotopic ileal neobladder was well opacified in 8/10 patients. Effective peristalsis of the afferent ileal segment was seen in all the Studer type neobladders. Ureteral reflux was not observed in any patient.

After orthotopic ileal neobladder reconstruction, the most frequent complications include urinary leakage, intestinal obstruction, venous thrombosis, stenosis of the neobladder anastomoses, incontinence, cancer recurrence, stone formation. In the follow-up, many diagnostic tools are used: intravenous urography, retrograde cystography, urodynamic studies, transabdominal and transrectal ultrasonography. With dynamic digital urography the nephrographic evaluation was possible in all patients, as well as the evaluation of calyceal, pyelic and ureteral opacification and even ureteral peristalsis. Moreover, this diagnostic tool allows the morphofunctional dynamic study of the ureteral-neobladder anastomoses and of the orthotopic ileal neobladder, even evaluating the residual peristalsis of the detubularized ileal segment. A major drawback of the new method is the relatively high radiation dose given to the patient. A limitation of the study is the selection of a population of completely or nearly asymptomatic patients.

Dynamic digital urography provides useful morphologic and functional information in the follow-up of patients with orthotopic ileal neobladder and could replace conventional urography in symptomatic patients.