<unk>  is a condition where the superior infundibulum of the upper calyx of the kidney is obstructed by the crossing renal (upper or middle section) artery branch, causing distension and dilatation of the calyx and presenting clinically as haematuria and nephralgia (ipsilateral flank pain). Furthermore, when the renal artery obstructs the proximal collecting system, filling defects can occur anywhere in the calyces, pelvis, or ureter. The condition was first described in the New England Journal of Medicine by urologist Elwin E.<unk>  in December 1966. While this is a rare disorder, most cases are asymptomatic. When complications do arise, it can be treated surgically after testing is done to identify the renal vasculature that is impacting renal output. Another possible cause for similar hydronephrosis is megacalicosis, for which surgery is considered inappropriate.
Fraley syndrome
Shapiro syndrome
Benedikt syndrome
Catel–Manzke syndrome
Mauriac syndrome
Benjamin syndrome
Schimke syndrome
Dravet syndrome