This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Radiology
Patient with right lumbar region pain. Most likely diagnosis is: 
Select and explain. 
A. Acute cholecystitis, B. Acute pyelonephritis, C. Right renal calculus, D. Left renal calculus
C: Right renal calculus
Answer: C: Right renal calculus 
Explanation: 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.