Assertion: xanthogranulomatous pyelonephritis | /r/RelatedTo | chronic obstruction
Facets:
value: from other calculus
type: OTHER
value: from tumor
type: OTHER
value: from stricture
type: OTHER
value: almost always
type: TEMPORAL
Source sentences:
text: Xanthogranulomatous pyelonephritis is a rare form of pyelonephritis that is almost always associated with chronic obstruction (eg, from staghorn calculus [75% of cases], other calculus, stricture, or tumor).