Findings:
There is a hyperdense renal calculus with width up to 3 x 4 mm in the distal segment of the right ureter, approximately 1 cm proximal to the right ureterovesical junction. Upstream hydronephrosis and hydroureter of the right collecting system. Mild right perinephric fat stranding.
No calculi or hydronephrosis can be identified on the left.
A few phleboliths are seen in the pelvic area on the right.
Both ureters and the bladder are normal.
The liver, spleen, pancreas and adrenals have a normal appearance.
The retrocaecal appendix is normal in appearance without evidence of acute inflammation or dilatation. The bowel is generally unremarkable without any wall thickening.
No free fluid or gas is seen in the abdomen or pelvis. No lymphadenopthy is identified.
The lung bases are clear.
No bony abnormality is seen.
Conclusion:
No evidence of an acute appendicitis.
Right-sided distal ureter stone (3 x 4 mm), approximately 1 cm proximal to the right UVJ causing upstream obstruction (hydronephrosis and hydroureter). Urological referral is advised.