Assertion: mri | /r/HasProperty | performed at the initiation of surveillance
Facets:
value: during active surveillance
type: TEMPORAL
Source sentences:
text: During active surveillance: For men with low-risk prostate cancers managed with active surveillance, MRI may be performed at the initiation of surveillance to rule out the presence of higher-grade elements not detected by a TRUS prostate biopsy, and also may be performed periodically in some cases to evaluate changes within the prostate.