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There are many causes for dizziness and balance disorders, including life-threatening conditions. The CT and MRI scans you had aim at ruling out sinister causes for vertigo. They are not meant to find out exactly what is happening. When the scans come back clear, your primary care physician may try medications that are available and see what happens.
However, the vestibular/balance system is very complex and sometimes the cause is not sinister and not straight forward. This is an example: Persistent Postural-Perceptual Dizziness (PPPD).
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