A 40 year old male presented to casualty with severe pain in the left upper abdomen radiating to groin. Urine routine shows 6-8 pus cells and 15-20 RBCs. CT scan was taken. What is the diagnosis?: (A) Aoic Aneurysm, (B) Acute cholecystitis, (C) Left ureteric calculus, (D) Acute Colitis
Answer is C. A non-contrast CT clearly shows a calculus in the left upper ureter