Abstract
Four patients underwent extracorporeal shock wave lithotripsy (ESWL) for large stones in the kidney resulting in disappearance of the radiopaque stones from the plain film. However, contrast study revealed that the collecting system was occupied by radiolucent filling defects, which were found to be composed of stone matrix material. All four patients had a history of urinary tract infection and deranged function of the kidney prior to the treatment. We suggest that the possibility of persistence of matrix material in the kidney after ESWL be taken into account when selecting the best way to treat similar patients.
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