Hi,
A differential for an enlarged kidney is hydronephrosis.In hydronephrosis, the collecting system of the kidneys are actually notably swollen and enlarged.This may be due to an underlying obstruction,reflux and blockage of the ureter. The underlying cause should have been persistent for quite sometime to lead to the condition.
In the case of reflux , the urine flows backward into the ureter and repeatedly may impede drainage of urine from the kidneys into the collecting system down to the bladder.There may be a familial or genetic cause behind this .
How did the consult go?
sounds exactly like what's going on with my 16 yr old daughter...hope you get to bottom of it soon, mine just had a CT last week but of course no results yet! keep me posted!