Renal forniceal rupture
Renal forniceal or calyceal rupture is the radiographic finding of a perirenal urine leak as a result of ureteric obstruction.
The renal fornix is the most susceptible part of the renal collecting system to rupture from increased pressure 2,3.
Causes include 1,2:
- ureteric calculus (~75%)
- extrinsic compression
- benign, e.g. pregnancy
- intrinsic obstruction, e.g. haematoma, tumour
- posterior urethral valves
- pelvi-ureteric junction obstruction
On non-contrast CT, perinephric low-density fluid and fat stranding will be present. On delayed phase imaging contrast will accumulate outside of the collecting system forming an urinoma 2.
- 1. Gershman B, Kulkarni N, Sahani DV, Eisner BH. Causes of renal forniceal rupture. BJU international. 108 (11): 1909-11; discussion 1912. doi:10.1111/j.1464-410X.2011.10164.x - Pubmed
- 2. Satomi Kawamoto, Katarzyna J. Macura. Genitourinary Imaging. ISBN: 0323085695
- 3. Stuart G. Silverman, Richard H. Cohan. CT Urography. ISBN: 0781787548