Which imaging studies are recommended urgently when optic neuritis is suspected?

• A. MRI and LP
• B. Color vision testing
• C. Electroretinography
• D. Slit lamp exam with tonometry

Answer: (A)

When optic neuritis is suspected, urgent evaluation focuses on identifying an inflammatory or demyelinating process, most notably multiple sclerosis, and ruling out other causes. An MRI of the brain and orbits with gadolinium is the imaging study of choice because it can reveal demyelinating lesions and optic nerve enhancement. This information helps confirm the inflammatory nature of the episode, guides prognosis, and informs treatment decisions. Lumbar puncture is often added when MS is suspected or when MRI results are inconclusive, since CSF analysis can show oligoclonal bands and an elevated IgG index, supporting a diagnosis of MS and helping differentiate from other conditions. Other tests like color vision testing, electroretinography, or slit lamp exam with tonometry don’t provide the urgent imaging information needed to evaluate suspected optic neuritis.