Perception of movement (rotational or otherwise) where no movement exists
Pathophysiology
Mismatch or asymmetric activity of visual, vestibular, and/or proprioceptive systems
Must distinguish peripheral from central cause
Peripheral: 8th CN, vestibular apparatus
Central: Brainstem, cerebellum
Mismatch or asymmetric activity of visual, vestibular, and/or proprioceptive systems
Peripheral: 8th CN, vestibular apparatus
Central: Brainstem, cerebellum
Vertigo
Vestibular/otologic
Tinnitus
Benign paroxysmal positional vertigo 
Sympathetic ophthalmia
Traumatic 
Herpes zoster ophthalmicus
Infection