<unk>  is a structural or functional hindrance of normal urine flow, sometimes leading to renal dysfunction<unk>  nephropathy).
It is a very broad term, and does not imply a location or etiology.
Obstructive uropathy
Interstitial cystitis
Pyonephrosis
Hemorrhagic cystitis
Pyelonephritis
Hydronephrosis
Glomerulonephrosis
Vesicoureteral reflux