Precise delineation of ureterocele anatomy: virtual magnetic resonance cystoscopy

To evaluate the application of virtual magnetic resonance cystoscopy (VMRC) in precise detection of ureterocele extension compared with conventional cystoscopy (as the gold standard) and other imaging modalities.

Medical records of 55 patients, with confirmed diagnosis of ureterocele during endoscopic surgery, were reviewed retrospectively. Thirty-two of them (14 girls and 18 boys, age range: 4-22 months) whom underwent investigation with magnetic resonance urography, voiding cystourethrography, and ultrasonography were included. Images were obtained using T1-scanner with pulse sequences (TR = 30-50 ms, TE = 2-8 ms, echo train length = 8 moderate, filip angel = 40°). Using multiplanar reformation from source images, the bladder was evaluated to determine ureterocele anatomy. Virtual findings were compared with other imaging studies.

Cystoscopy confirmed 3(9%) bilateral and 9(28%) unilateral intravesical ureteroceles, and 20(63%) ectopic type. VMRC was the most sensitive method in detection of ureterocele anatomy and its extension (detection rate: 94%) It detected one case of bilateral intravesical and three ectopic types, which were not detected in other imaging modalities.

VMRC is a promising non-invasive technique in exact detection of ureterocele extension prior to endoscopic operation. It permits evaluation of concurrent genitourinary abnormalities and facilitates preoperative planning especially in complex ectopic ureteroceles. It may be indicated as a clinical routine, when conventional cystoscopy is contraindicated.