<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 cause.
Obstructive uropathy
Interstitial cystitis
Emphysematous cystitis
Pyonephrosis
Hemorrhagic cystitis
Pyelonephritis
Eosinophilic cystitis
Hydronephrosis