text: are your kidneys ment to be different sizes? just been and had an ultrasound and they both looked different shapes. one was 120.0 dm and the other was 92.0 dm whatever that means (diameter?) please if you know could you tell me its not unusual. one is usually lower than the other too.  there is also room for measurement error because one kidney may be lying at a slight angle relative to the other, thus foreshortening its appearance in a two-dimensional medium like ultrasound.