What is the role of IVP in the workup of hypercalciuria?

Updated: Apr 23, 2019
  • Author: Stephen W Leslie, MD, FACS; Chief Editor: Vecihi Batuman, MD, FASN  more...
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Answer

Medullary sponge kidney is a congenital condition that is most easily diagnosed by intravenous (IV) pyelography; no specific treatment for it exists. The condition appears as a whitish blush in the renal papilla, which is caused by the cystic dilatation of the distal collecting ducts before they empty into the renal pelvis. On CT scan, the diagnosis may require IV contrast.

Patients with medullary sponge kidney are quite likely to produce kidney stones, with about 60% developing nephrolithiasis at some point. About 12% of all stone formers are thought to have medullary sponge kidney (although the exact incidence is uncertain, ranging from 2.6-21% in various studies). Renal leak hypercalciuria is more frequently found in patients with medullary sponge kidney than in other hypercalciuric calcium-stone formers.


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