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A 27-year-old patient with a chief complaint of mild vertigo of 3-months duration is seen by a neurologist. Examination reveals a positional (horizontal and vertical) nystagmus that is bidirectional. The patient reports the absence of tinnitus. Which of the following is the most likely etiology of the vertigo?
Labyrinthitis
Ménière’s syndrome
Lesion of the flocculonodular lobe of the cerebellum
Lesion of the spinocerebellum
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