stag·horn calculus 'stag-.hȯ(ə)rn- n a large renal calculus with multiple irregular branches
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a branched stone forming a cast of the collecting system of the kidney and therefore filling the calyces and pelvis. The stone is usually associated with infected urine, the commonest organism being Proteus vulgaris. The combination of obstruction and infection can cause pyonephrosis and, if neglected, a perinephric abscess.
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a urinary calculus, usually struvite, found in the renal pelvis and shaped like the antlers of a stag because it extends into multiple calices.Medical dictionary. 2011.