Assertion: congenital obstruction | /r/HasSubevent | failed relaxation
Facets:
value: at the upj
type: LOCATION
Source sentences:
text: The pathogenesis of UPJ obstruction is not fully understood, but congenital UPJ obstruction is most likely an intrinsic muscular deficiency, resulting in failed relaxation at the UPJ [], somewhat analogous to achalasia of the esophagus.