Likely insignificant: The renal length varies with height and weight and decreases slowly with age. Right kidney is usually slightly smaller than the Left. Normal size ranges from 9-12 cm (90-120 mm) and the difference in size should not exceed 2 cm. So the right kidney being "slightly" smaller is likely insignificant. If you have the actual measurements you can interpret them using the above guidelines.
Answered 7/14/2016
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