Most frequently caliceal diverticula are found incidentally on routine excretory urograms. Smaller diverticula are associated with a low incidence of complications but larger diverticula with a narrow communication to the main collecting system will predispose to calculous formation as a result of stasis of urine within the diverticulum. The techniques used and results achieved in 10 patients with such calculi who have been successfully managed percutaneously are discussed. Particular reference is made to techniques used specifically to obliterate the diverticula.
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