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Nephrolithiasis involves the formation of solid crystalline deposits within the kidneys or urinary tract, commonly composed of calcium oxalate, calcium phosphate, uric acid, or struvite. These stones can range from microscopic crystals to large obstructive masses that cause severe pain and complications. The condition affects approximately 10% of the population and has a high recurrence rate without proper management.
Stone formation occurs when urine becomes supersaturated with stone-forming substances, leading to crystal nucleation, growth, and aggregation. Factors contributing to supersaturation include dehydration, dietary excess of stone-forming minerals, metabolic abnormalities, and urinary pH alterations. The process involves initial crystal formation on renal papillae or existing debris, followed by progressive mineral deposition and stone growth within the collecting system.
Diagnosis relies on characteristic symptoms of severe flank pain radiating to the groin, hematuria, and nausea, supported by imaging studies showing radiopaque or radiolucent masses with associated hydronephrosis. Stone composition analysis and metabolic evaluation help identify underlying risk factors such as hypercalciuria, hyperoxaluria, or hyperuricemia. Treatment decisions depend on stone size, location, composition, and patient symptoms, ranging from conservative management with hydration and pain control to interventional procedures like lithotripsy or ureteroscopy.
Key imaging focus: Stone location, size, hydronephrosis, perinephric stranding