The ultrasound with Doppler of both kidneys were done looking for evidence of a blockage in one or both of the kidney arteries. The result suggest that the right kidney is very small. Men should have at least 11 centimeter kidneys. The left kidney is slightly small and shows changes of chronic kidney disease (in general this suggests scarring of his left kidney and marked scarring or atrophy of his right kidney. This could mean that the right kidney was small at birth or developed later in life. The report does not differentiate these two possibilities. There was not evidence for blockage of the kidney arteries and changes in the Doppler are more consistent with scarring and chronic kidney disease.
I am unable to provide any other specific diagnosis based on the ultrasound and Doppler findings.