The kidney stone is located in the back of the left kidney. 0.5cm is a small stone, but certainly big enough to cause symptoms.
If it was big enough to cause a urinary obstruction, there would have been swelling of the kidney that would be seen on the CT scan.
Most kidney stones pass on their own, however I would be evaluated by a physician to ensure no other intervention needs to be done for the stone.
Followup with your personal physician is essential.
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