Urothelial striations revisited.

Abstract

To confirm that use of low-osmolality contrast media (LOCM) in urography increases the frequency with which striations occur in otherwise healthy adults. Two series of urograms obtained in 207 adult patients (101 men, 106 women) at two institutions after the administration of either LOCM or high-osmolality contrast media (HOCM) were reviewed. At the first, 106 patients had received LOCM; at the second, 101 had received HOCM. Protocols were similar. Urograms were evaluated for the presence and extent of striations. Of 106 LOCM urograms, 16 (15%) showed striations. Of 101 HOCM urograms, only two (2%) showed striations. The difference in striations shown between the two groups was significant (P < .002). Striations were most common in renal pelves and distal ureters and on radiographs obtained after voiding. Detection of urothelial striations on LOCM urograms in adults is most often normal. Increased prevalence of striations is likely due to decreased urinary tract distention associated with LOCM use.