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[Clinical studies on medullary sponge kidney evaluated from urolithiasis]
1Department of Urology, Kawasaki Medical School.
Summary
Medullary sponge kidney (MSK) affects 4.3% of urolithiasis patients. MSK patients show normal renal function but a tendency toward increased phosphate and decreased citrate in urine, suggesting metabolic differences in stone formation.
Area of Science:
- Nephrology
- Urology
- Medical Imaging
Background:
- Medullary sponge kidney (MSK) is a congenital renal malformation.
- Urolithiasis is a common condition associated with various underlying pathologies.
- Understanding the clinical and metabolic characteristics of MSK in stone formers is crucial for patient management.
Purpose of the Study:
- To investigate the clinical and metabolic features of patients with medullary sponge kidney (MSK) and urolithiasis.
- To compare the metabolic profiles of MSK patients with general stone formers.
Main Methods:
- Retrospective analysis of 881 patients with urolithiasis over 12 years.
- Diagnosis of MSK confirmed by drip infusion pyelography.
- Clinical evaluation, urinalysis, urine culture, renal function tests (PSP, creatinine clearance), and urinary metabolic studies (calcium, phosphate, uric acid, citrate).
Main Results:
- MSK was detected in 4.3% of urolithiasis patients.
- Hematuria was common (52.6%); infections were noted in 4 patients.
- Renal function was generally normal, but concentration tests were impaired in 50% of patients.
- MSK lesions were bilateral in 84.2% of cases.
- MSK patients showed a tendency towards hyperphosphaturia and hypocitraturia compared to general stone formers.
Conclusions:
- Medullary sponge kidney is a significant finding in a subset of urolithiasis patients.
- While renal function may be preserved, MSK is associated with altered urinary metabolism, particularly phosphate and citrate levels.
- These metabolic findings may contribute to stone formation in MSK patients and warrant further investigation.