Percutaneous trocar (needle) nephrostomy in hydronephrosis.
D006801:Humans; D006869:Hydronephrosis / Q000601:surgery*; D007668:Kidney / Q000601:surgery*; D009339:Needles; D013525:Surgical Instruments; D014570:Urologic Diseases
HYDRONEPHROSIS/surgery; KIDNEYS/surgery