Assertion: brain tumor | /r/ObjectUse | used as precursor
Facets:
value: for tissue biopsy
type: PURPOSE
value: by some veterinarians
type: OTHER
Source sentences:
text: In some cases, magnetic resonance imaging (MRI) or computed tomography (CT) of the dog's brain are necessary to confirm the diagnosis of brain tumors, or they may be used as precursors for tissue biopsy by some veterinarians.