Assertion: obstruction's cause | /r/HasProperty | stricture
Facets:
value: before bladder
type: LOCATION
Source sentences:
text: Upper Urinary tract obstruction: (Before bladder) Common causes of upper urinary tract obstruction include stricture (an abnormal narrowing of a bodily passage) or congenital compression of a calyx or the ureteropelvic or ureterovesical junction (e.g. stones [calculi]); compression from an aberrant vessel (deviates from normal course), tumor, or abdominal inflammation and scarring (retroperitoneal fibrosis); or ureteral blockage from stones or a malignancy of the renal pelvis or ureter.