There is a calculus measuring 4.5 mm (average density = 245 HU) in the distal right ureter. It is associated with mild proximal hydroureteronephrosis and mild right perinephric fat stranding.
There is also a well-defined hypodensity measuring about 4.3 x 4.4 cm (average density = 21 HU) at the upper pole of the right kidney, which is likely a renal cortical cyst.