Medullary Sponge Kidney and Calcium Nephrolithiasis

A wide variation (from 3.6% to 13%) in the prevalence of medullary sponge kidney (MSK) has been reported in calcium stone formers (CSF) (1–3), Furthermore, the existence of peculiar metabolic abnormalities with respect to idiopathic calcium nephrolithiasis (ICN) is debated (1, 2, 4, 5). Therefore we evaluated the MSK prevalence in 138 consecutive CSF and the possible clinical and metabolic difference between MSK and ICN patients in our unit.