The upper urinary tract following a ureteroneocystostomy (UNC) in an animal experiment: II. Morphological findings

Ureteral Obstruction After Ureteroneocystostomy in Dogs Assessed by Technetium Tc 99m Diethylenetriamine Pentaacetic Acid (DTPA) Scintigraphy

“…Prolonged collecting system dilatation after ureteroneocystostomy in cats has been attributed to the small size of the ureter. Reimplanted ureters in the present study were dilated because of previously induced ureteral obstruction, unlike in similar studies with dogs and cats 4,7 . Megaloureter sometimes is present in clinical patients undergoing ureteroneocystostomy.…”

“…Relief of the obstructive pattern, as seen on the parenchymal TAC of affected kidneys, was observed during the second week after ureteroneocystostomy (ie, between 7 and 11 days) in the present study. Ureteral and pelvic dilatation, as assessed by excretory urography, has been described 7 days after ureteroneocystostomy in experimental dogs 7 . In this latter study, however, serial examination of the collecting system was not performed.…”

“…In cats, pyelectasia has been observed by using excretory urography and ultrasonography for up to 12 weeks after ureteroneocystostomy 4 . Ureteral obstruction after ureteroneocystostomy has been attributed to submucosal edema at the ureteroneocystostomy site 7 . Prolonged collecting system dilatation after ureteroneocystostomy in cats has been attributed to the small size of the ureter.…”

“…Ultrasonography and excretory urography are diagnostic procedures commonly used to assess and monitor dilatation of the collecting system after surgery 4,7 . However, these diagnostic tests do not assess renal function or whether ureteral obstruction exists.…”

“…5,6 Ultrasonography and excretory urography are diagnostic procedures commonly used to assess and monitor dilatation of the collecting system after surgery. 4,7 However, these diagnostic tests do not assess renal function or whether ureteral obstruction exists. When performing ureteroneocystostomy on an already dilated collecting system, resolution of ureteral and pelvic dilatation also depends on the compliance of the collecting system.…”