The elderly with ureteral obstruction, caused by malignant terminal illness who have a life expectancy of 1 year or over.
In these cases, a metal stent is a better choice over a double J stent. This is because a metallic ureteral stent is able to withstand tissue ingrowth and larger urine outputs following the administration of fluids after chemotherapy treatment.
Moreover, it is designed to prevent migration. Distal part is 1 mm is larger than the body of the ureter and the distal part is covered with a bare stent.