Abstract
Matrix urinary calculi are an uncommon but well-recognized clinical entity often associated with infection. The organic matrix composition that characterizes these stones can make diagnosis difficult. The clinical and radiographic features of two recent cases are presented. Contrast studies are the primary tools for the diagnosis of these and other radiolucent lesions. Ultrasound is of little value, but CT may be useful. In treatment extracorporeal shock wave lithotripsy is not effective. Endoscopic techniques appear most useful in diagnosis, and percutaneous extraction provides excellent results.
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