Dear User, I would suggest to perform a renal ultrasound. I suppose that the stent was removed by urinary tract. US is helpful to be sure that there is not an ongoing hydroureteronephrosis. Also a complete renal screening (serum creatinine, azotemia, sodium, potassium, calcium and blood gases) is recommended. However, if negative, the pain may be due by the procedure itself which is invasive (remember that urines are acid, and ureter may be a little stretched by the instrument and the stent itself).