<prompt> Patient with right lumbar region pain. Most likely diagnosis is:Acute cholecystitisAcute pyelonephritisRight renal calculusLeft renal calculus  <response>: Ans. C Right renal calculusCoronal reconstructed CT KUB image shows a calcific density hyperdense in lower pole of right kidney. Nearly all renal calculi even those radiolucent on radiograph are seen onCT KUB except indinavir associated calculi. NC-CT is IOC for urolithiasisQ. 