Urolithiasis (stones in UT) = most form in kidneyRenal calculi ? colic, obstruction, infection, hematuria Most important predisposing factor ? supersaturation low urine volume favors stone formationTypes of stones1. Calcium oxalate ( /- calcium phosphate)Most common (75% of cases)Causes= Hyperparathyroidism, Bone Mets, ? Ca absorptionResults in Renal hypercalciuria2. Magnesium ammonium phosphate stones= (15% of cases) Also called Triple phosphateAssociated with infections by urea 1141
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