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Medullary sponge kidney: abnormalities of renal tubular and glomerular function, and their relationship to clinical
Abstract:
This study confirms that medullary sponge kidney (MSK) has a good prognosis, but there is a considerable morbidity in patients with renal calcification; they suffer renal colic, ureteric obstruction, and frequently need operation. There is a high incidence of urinary infection in women. On follow-up, glomerular function is well maintained, although careful testing shows a mild depression of glomerular filtration rate in at least 40%. Proximal tubular function is normal, but abnormalities of distal tubular function are often seen: acidification defects occur in 24% and are associated with nephrocalcinosis, poor urine concentrating ability, and diminished glomerular function. Urine concentration defects occur in 73% and are probably secondary to nephrocalcinosis. Hypercalciuria was present in 19% and was not related to other defects.
Insights
Medullary sponge kidney (MSK) generally has a good prognosis. However, renal calcification leads to significant morbidity, including pain, obstruction, and infections, particularly in women.
Area of Science:
- Nephrology
- Urology
- Medical Research
Background:
- Medullary sponge kidney (MSK) is a congenital renal malformation.
- While often asymptomatic, MSK can be associated with complications like nephrocalcinosis and urinary tract infections.
Purpose of the Study:
- To evaluate the long-term prognosis and associated morbidity in patients with medullary sponge kidney.
- To identify specific complications and functional deficits in MSK patients.
Main Methods:
- Longitudinal follow-up of patients diagnosed with medullary sponge kidney.
- Assessment of renal function, including glomerular filtration rate and tubular function (acidification, concentration).
- Analysis of complications such as renal colic, obstruction, infections, and nephrocalcinosis.
Main Results:
- Medullary sponge kidney (MSK) demonstrates a generally good prognosis.
- Renal calcification significantly increases morbidity, leading to renal colic, ureteric obstruction, and need for surgery.
- A high incidence of urinary infections is noted in female patients.
- Mild depression of glomerular filtration rate (GFR) observed in 40% of patients.
- Distal tubular dysfunction, including acidification defects (24%) and impaired urine concentrating ability (73%), is common, often linked to nephrocalcinosis.
- Hypercalciuria present in 19% of patients, unrelated to other defects.
Conclusions:
- Medullary sponge kidney (MSK) patients experience good overall prognosis, but complications are frequent.
- Nephrocalcinosis is a major driver of morbidity, impacting renal function and increasing the risk of infections and obstruction.
- Monitoring for and managing complications like nephrocalcinosis and tubular dysfunction is crucial for MSK patients.