My husband only has one kidney has been struggling with edema (33lbs in 6 weeks) weight keeps going up. Renal function ok. Just been to hospital and doc says from a recent ct scan shows dilated upper pole of kidney. Doc says their are no stones have you any ideas what could be causing the blockage and could the blockage cause the edema?
Dilatation of upper part of ureter doesn't always mean a stone obstructing it. He must have had a stone which was there for some time and passed off in the urine. Hence dilation and no stone seen in that area.  Sometimes even with urinary tract infection, there can be dilatation. You can get plain ct abdomen to check whether there is any stone in that area