Hello and hope you are doing well.
Pelvocaliectasia is the dilation of the pelvis and the calyceal system without an obstruction in the distal collecting system, namely the ureter. This could be a normal occurence, as opposed to hydronephrosis, which occurs due to a distal obstruction.
Hope this helped and do keep us posted.
You may want to post on our expert Radiology forum ..
http://www.medhelp.org/forums/Radiology/show/909
I don't know the answer but wanted to stop by with the above link.
C~