Thanks for writing in.
The size of the renal pelvis
is almost normal and not something you should be unduly worried about. We however would need to know the case of the dilation. A CT scan
of the kidneys and the bladder would be a step in the right direction.
Once we know the cause of the dilation, we will know whether it causes scarring or not. Scarring is a complication of untreated hydronephrosis
and it is unlikely that you are down this path.
Please see a urologist
who can help you identify the nature of the obstruction.