A 56-year-old man presents with 10 days of disequilibrium and rotational vertigo after a viral upper respiratory illness. Caloric responses are symmetric. Horizontal head-impulse test is normal. Hearing thresholds are normal bilaterally.

Investigations

What is the most likely diagnosis?

• ARight inferior vestibular neuritis
• BFunctional / psychogenic vertigo
• CVestibular migraine
• DBilateral vestibulopathy