Medullary sponge kidney
Urinary tract infection and chronic back pain. CT was done to rule out urolithiasis.
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CT IVP demonstrates numerous small calcifications located in the renal calculi which are non-obstructing and measure up to 3mm on the right and 4mm on the left. Urographic phase imaging demonstrates dilated renal tubules in which these non-obstructing calculi are located.
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Overall, the appearances of this case are most in keeping with medullary sponge kidney, a relatively common but often under diagnosed condition.