CT
A radiopaque calculus measuring 6 x 10 mm (average density=950 HU) is seen in the lower pole calyx of the left kidney. Mild left hydronephrosis and mild left perinephric fat stranding. Prominent/mildly dilated left ureter traceable throughout its course without any radiopaque calculus. Air/gas is seen in the left renal collecting system, left ureter and urinary bladder. A Foley catheter is seen in the urinary bladder.