[Percutaneous antegrade needle hydronephrosis as an emergency measure in the management (author's transl)].

The needle of acute aspiration of the pyelon assures immediate drainage of the urine in a hydronephrosis with a distended calceal system. This emergency measure often is necessary in acute high risk cases which are often gynecological cases. A cannula for percutaneous needle aspiration of the kidney basin is presented. With this cannula antegrade percutaneous translumbar needle drainage of the kidney basin is possible without operative risk. Operative exposure of a hydronephrotic kidney with the only aim of nephrostomy can be avoided with this method in most cases.