Abstract
Coagulum pyelolithotomy is mainly indicated in cases of multiple stones, soft and crumbly stone or stones, small, mobile caliceal stones, and as an aid to fixing caliceal stone or stones in the calix prior to partial resection of the kidney or nephrolithotomy. Its main advantages are:— Trauma to the kidney is minimized.All the free stones in the pelvicaliceal system may be removed, thus reducing the incidence of so-called ‘recurrent’ stones.Fragmentation of the stone during removal is avoided.Surgical mobilization of the kidney is not necessary since it is sufficient to expose the pelvis. A method of coagulum pyelolithotomy is described in detail and discussed. The operation has been performed in 22 cases with good results. Two cases are described in detail. It is suggested that this method could be utilized for common bile-duct stones.

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