I Recently Had An Ultra Sound On My Kidneys Because

I recently had an ultra sound on my kidneys because I was suffering from a bad kidney infection and had excruciating pain on my right lower side. I have been waking up in pain every morning which seems to go away after a couple of hours. The test showed I have mild thinning of the renal cortex bilaterally prominent renal sinus fat. Is this serious and is the pain caused by the infection and/or the thinning issue?