i was having a back for a last 2 weeks,i thought dats its just of my operation of the spine way back 2008,,but then i found my feet have a little edema,and i a few days i have feel dat my bladder is full but iurinate only little...i went to have a kidney ultrasound and the results are this,,,Right kidney :9,0x4.1x4.1cm...Left kidney:9.0x4.1x4.3cm Both Kidneys are normal in size and orientation...the corticomedulary junction appears intact, with distinct corticomedullary differentiation..there is a0.7x0.5cm hypoechoic focus in the upper left kidney.no lithiasis identified on both kidneys.....Impression...1. Hypoechoeic focus in the left kidney,,may reflect Focal Calietasia Vs a cyst....2.unremarkable right kidney...3..other details as discussed..,thank you