A patient visits the emergency department after a motor vehicle accident. He has suffered multiple blunt force head traumas. This patient's injury would be described as:
A. Focal.
B. Multifocal.
C. Diffuse.
D. Both B and C
ANS: B
Rationale: Damage or injuries to the central nervous system are categorized as being focal, multifocal, or diffuse lesions. Focal lesions are limited to a single location, multifocal lesions are limited to several nonsymmetric locations, and diffuse lesions affect bilateral structures symmetrically but do not cross the midline as a single lesion.
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