A patient has dozens of stereotyped attacks of spinning lasting under one minute, sometimes provoked by head position, with normal examination between episodes. MRI shows a vascular loop contacting the eighth nerve. What is the most appropriate diagnostic principle?
Vestibular paroxysmia is attributed to neurovascular cross-compression, but vascular loops are common in asymptomatic people. Brief frequent stereotyped attacks and therapeutic response carry more diagnostic weight than MRI alone.
A. Diagnose BPPV solely from positional triggering: BPPV has canal-specific positional nystagmus and attacks linked to positional testing.
B. Diagnose Ménière disease: Ménière attacks usually last 20 minutes to hours with cochlear fluctuation.
C. Use the clinical attack pattern and response to sodium-channel blockade; vascular contact alone is not diagnostic: Vestibular paroxysmia is attributed to neurovascular cross-compression, but vascular loops are common in asymptomatic people. Brief frequent stereotyped attacks and therapeutic response carry more diagnostic weight than MRI alone.
D. Offer microvascular decompression immediately: Medical treatment and diagnostic confidence precede high-risk surgery.
E. Ignore the attacks because examination is normal: Paroxysmal disorders may have normal interictal findings.
If attacks lasted hours with fluctuating low-frequency hearing loss and aural pressure, Ménière disease would be more likely.
Independent Clinora educational preparation material; not official JCIE content, an accredited programme, clinical advice, or a substitute for current guidance, local policy and specialist judgement.
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