Horseshoe kidney with ureteral stone
Colicky abdominal pain, radiating to the lumbar spine.
2 case question available
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Horseshoe kidney with a 6 mm stone at the right ureterovesicular junction (UVJ). There is dilatation of the upstream collection system with stranding and a small amount of free fluid anterior to the right renal pelvis and proximal ureter, compatible with rupture and urine leak into the peritoneal space.
Left-sided collecting system is not dilated.
The appendix is normal.
3 case question available
Persons with horseshoe kidneys are at higher risk for renal calculi than the average population (~20% lifetime risk). Because of ectopic exit of the ureters from the horseshoe kidney, the increased risk of stones has been thought to be due to urine stasis rather than abnormalities of the renal parenchyma. Some think that a combination of relative urinary stasis and metabolic abnormalities in the horseshoe kidney are required for stone formation.
- 1. Gross AJ, Fisher M. Management of stones in patients with anomalously sited kidneys. Curr Opin Urol. 2006;16 (2): 100-5. doi:10.1097/01.mou.0000193380.16480.e1 - Pubmed citation
- 2. Raj GV, Auge BK, Assimos D et-al. Metabolic abnormalities associated with renal calculi in patients with horseshoe kidneys. J. Endourol. 2004;18 (2): 157-61. doi:10.1089/089277904322959798 - Pubmed citation
- 3. Mesrobian HG, Kelalis PP, Hrabovsky E et-al. Wilms tumor in horseshoe kidneys: a report from the National Wilms Tumor Study. J. Urol. 1985;133 (6): 1002-3. Pubmed citation