Sections
Eighth Nerve Trauma | Diffuse Axonal Injury
Excerpt
TBI may be complicated by direct injury to the vestibular
or eighth cranial nerve (Maskell et al. 2006; Ostrowski and Bojrab 2005). Shearing forces may lead to transection,
hemorrhagic, or ischemic damage to the nerve. This may occur anywhere
along its course, either within the internal auditory canal or as
it enters the brain stem at the cerebellar pontine angle. Injury
to the vestibular nuclei in the brain stem may lead to central findings
on both physical exam and diagnostic testing, such as hemorrhage
on MRI or unilateral vestibular loss on ENG/VNG. Either
with conservative measure or intensive vestibular rehabilitation,
improvement in vertigo is usually achieved. Ultimately, however,
if the vestibular nuclei on the injured side are nonfunctional,
complete compensation may be impossible (Ostrowski and Bojrab 2005).