Ileal ureter interposition

Case contributed by Matt A. Morgan
Diagnosis certain


Patient post left nephrectomy and partial right nephrectomy complicated by a renal-cutaneous fistula with recurrent perinephric infection. He then underwent surgery to treat the fistula.

Patient Data

Age: 70 years
Gender: Male

Antegrade pyelogram /...


Antegrade pyelogram / nephrostogram

Antegrade pyelography / nephrostogram for evaluation of an ileal interpostion between the right renal pelvis and the bladder.

As water soluble contrast fills the collecting system it enters the bowel loop and gradually proceeds antegrade toward the bladder.

There had been a right ureteral stent which had migrated entirely into the bladder, as can be seen on the scout image.


CT correlate: A midly dilated, tortuous loop of ileum extends from the right renal pelvis to the bladder. The renal pelvis is not dilated.

Case Discussion

If a ureter is partially damaged, it can be bypassed with a nephroureteral stent, but if it needs to be removed, then options such a psoas hitch or transureteroureterostomy can be considered.

If the entire ureter needs to be removed, then an ileal ureter interposition can be considered. Colon could also potentially be used. In a way, the interposition graft concept is a variant of neobladder (such as an ileal conduit), except it is creation of a neo-ureter.

A ileal ureter interposition can be evaluated with

Complications of an ileal interposition include mucus formation and stone formation in the ileal segment.

How to use cases

You can use Radiopaedia cases in a variety of ways to help you learn and teach.

Creating your own cases is easy.

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.