The adynamic terminal ureteral segment.

Recently, we observed hydroureteronephrosis owing to an adynamic transmural distal ureteral segment associated with a thickened bladder, consequent to bladder outlet obstruction. Histological examination disclosed a loss of intrinsic musculature of the terminal ureteral segment with fibrosis. The importance of this entity is in the fact that upper tract dilatation and deterioration may progress, despite apparently successful correction of the bladder outlet uropathy.