Abstract
A simple and innocuous method for colouring the renal cortex is proposed. lt makes visible, during thc operation, the line of demarcation betwcen different arterial areas and allows the performance of nephrotomies with minimal trauma to the renal parenchyma and a minimum of subsequent renal dcstruction by ischaemia. lt is indicated as a complement to renal hypothermia, for the removal of complicated and extensive lithiasis; it can also be helpful in easier cases when hypothermia is not required.

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