Childhood Optic Neuritis Workup
- Author: Martha P Schatz, MD; Chief Editor: Hampton Roy Sr, MD more...
Laboratory Studies
Lumbar puncture with measurement of opening pressure excludes papilledema secondary to intracranial hypertension.
Cerebrospinal fluid (CSF) studies may indicate the presence of a simultaneous meningitis or encephalitis, but a mild lymphocytic pleocytosis may be present with optic neuritis.
NMO (neuromyelitis optica) antibody in serum helps establish a diagnosis of neuromyelitis optica.
Systemic lab studies can be performed directed by features in the history and physical examination consistent with other non–immune-mediated causes of optic neuritis.
Imaging Studies
An MRI of the brain and orbits with contrast should be performed.
- Enhancement of the optic nerve in the orbit or the intracranial segment of the optic nerve or of the chiasm is helpful in confirming the diagnosis. Some enlargement of the optic nerve is present in optic neuritis, and a diagnosis of optic nerve glioma should not be made unless the clinical course dictates reconsideration of the diagnosis of optic neuritis.
- An MRI should exclude extrinsic compressive lesions.
- Meningeal enhancement suggests some form of infectious or noninfectious meningitis and may merit additional workup and different therapy.
- Changes in the CNS white matter may confirm other neurologic involvement found on physical examination, may affect the prognosis of MS in the future, or may indicate the presence of acute disseminated encephalomyelitis. One third of children with optic neuritis will have asymptomatic white matter lesions of the brain as compared to one half of adults with optic neuritis.
- The images below depict characteristics relevant to a diagnosis of optic neuritis.
T1 contrast enhanced axial section of an MRI of the orbital optic nerve of a child with optic neuritis on the left side. The arrows point to the left optic nerve that enhances along its entire orbital course.
T1 contrast enhanced coronal section of the MRI of the orbital optic nerve. The arrow points to the enhancing left optic nerve.
T1 contrast enhanced axial section of an MRI of the intracranial optic nerves. Enhancement of both optic nerves is seen. The arrow indicates the left optic nerve.
T1 contrast enhanced coronal section of the MRI showing the optic nerves that both enhance. The arrow points to the left optic nerve.
T2 axial section of an MRI through the cerebral hemisphere of a boy with bilateral optic neuritis. Note high-signal abnormalities in the cerebral white matter that are most prominent in the posterior hemispheres. This is suspicious for mild acute disseminated leukoencephalitis.
To either diagnose or exclude neuromyelitis optica (Devic disease), an MRI of the spinal cord with contrast is necessary if symptoms and signs consistent with a spinal cord process are present.
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| Adult Optic Neuritis | Pediatric Optic Neuritis |
| Unilateral | Bilateral |
| Retrobulbar optic neuritis | Papillitis |
| Commonly associated with pain on eye movements | Commonly associated with headache |
| Most often idiopathic | Most often postinfectious or postimmunization |
| High probability of recurrent inflammatory demyelinating events in the CNS and a diagnosis of MS | Low probability of recurrent demyelinating events and a diagnosis of MS |
| Corticosteroid Drug | Approximate Equivalent Dose |
| Prednisone | 5 mg |
| Prednisolone | 5 mg |
| Methylprednisolone | 4 mg |
| Dexamethasone | 0.75 mg |
| Age | Risk for Development of MS |
| 10 years | 13% |
| 20 years | 19% |
| 30 years | 22% |
| 40 years | 26% |

