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1Paediatric Nephrology Unit, Chaim Sheba Medical Centre, Sackler Faculty of Medicine, Tel Aviv University, Israel.
Insights
Urinary tract stone formation is linked to diet, infections, and metabolic issues. Understanding these causes aids in diagnosing and managing kidney stones effectively.
Area of Science:
- Nephrology
- Urology
- Biochemistry
Background:
- Urinary tract stone formation exhibits diverse epidemiological patterns.
- Factors influencing stone formation include diet, urinary tract infections (UTIs), and metabolic disorders.
Purpose of the Study:
- To review the mechanisms of urinary tract stone formation.
- To discuss the diagnosis and management of renal tract calculi.
Main Methods:
- Literature review of urinary tract stone formation mechanisms.
- Analysis of factors contributing to different stone types and their epidemiological patterns.
Main Results:
- Calcium stones are associated with hypercalciuria, urine acidification defects, hypercalcaemia, hyperoxaluria, hyperuricosuria, alkaline urine, and hypocitraturia.
- Uric acid stones form in acidic urine due to purine metabolism issues or lympho-/myeloproliferative disorders.
- Cystinuria, an inherited disorder, requires low sodium, high fluid intake, specific urine pH, and potentially penicillamine.
- Oxalate stones relate to diet, bowel disease, and metabolic defects.
- UTI-induced struvite and carbonate apatite stones are common in Europe.
Conclusions:
- Stone formation is multifactorial, involving diet, infection, and metabolic status.
- Tailored management strategies are crucial for different stone types, including calcium, uric acid, cystine, oxalate, and infection stones.
Abstract:
The mechanism of stone formation in the urinary tract is reviewed. Diet, urinary tract infection and metabolic disorders account for the different epidemiological patterns of stone formation. The diagnosis and management of renal tract calculi are discussed. Calcium stones are associated with hypercalciuria, urine acidification defects, the use of furosemide in premature babies, hypercalcaemia, hyperoxaluria, hyperuricosuria, an alkaline urine and hypocitraturia. Uric acid stones occur in acid urine, from increased purine synthesis with lympho- or myeloproliferative disorders or from several inborn errors of purine metabolism which can also cause xanthine or dihydroxyadenine stones. Cystinuria, inherited as an autosomal recessive disorder is best treated with a low sodium diet, a fluid intake exceeding 40 ml/kg per day maintaining urine pH between 7.5 and 8 and, if necessary, with oral penicillamine. Oxalate stones occur in relation to diet, bowel disease and primary inherited defects in oxalate metabolism. Urinary tract infection causing struvite and carbonate apatite formation is the commonest cause of stones in Europe.
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