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Systemic causes of bilateral retrobulbar optic neuritis

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bilateral optic neuritis systemic causes MOG NMOSD sarcoidosis infections review

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Systemic causes of bilateral retrobulbar optic neuritis
Bilateral involvement is atypical for usual MS-associated optic neuritis and should raise suspicion of an alternative systemic inflammatory, infectious, or paraneoplastic disorder. A neuro-ophthalmology review notes that severe or bilateral optic neuritis particularly suggests NMOSD or MOG-antibody disease.

1. Demyelinating and immune-mediated disorders

  • Neuromyelitis optica spectrum disorder (NMOSD) - anti-aquaporin-4 antibody associated; often severe, bilateral, longitudinally extensive, and may involve the optic chiasm.
  • MOG-antibody associated disease (MOGAD) - commonly bilateral or recurrent; optic disc edema may be present despite retrobulbar involvement.
  • Multiple sclerosis - usually unilateral, but occasionally bilateral, especially in children or postinfectious cases.
  • Chronic relapsing inflammatory optic neuropathy (CRION).

2. Systemic autoimmune and granulomatous disease

  • Systemic lupus erythematosus
  • Sjögren syndrome
  • Sarcoidosis / neurosarcoidosis
  • Granulomatosis with polyangiitis
  • Less commonly, other systemic vasculitic or connective-tissue diseases.
The rheumatology text specifically lists NMOSD, MOG-associated optic neuritis, SLE, Sjögren syndrome, sarcoidosis, and paraneoplastic optic neuropathy among immune-related causes of acute optic neuropathy. Rheumatology, p. 372.

3. Infectious and postinfectious causes

  • Syphilis
  • Tuberculosis
  • HIV-related opportunistic infection, including cryptococcal disease
  • Viral illness or postviral optic neuritis: measles, mumps, varicella-zoster, EBV/infectious mononucleosis, encephalitic viruses
  • Bartonella henselae (cat-scratch disease)
  • Lyme disease, toxoplasmosis, and other infections where epidemiologically appropriate
  • Post-vaccination optic neuritis, particularly reported in children
Tintinalli’s Emergency Medicine lists postvaccination disease, measles, mumps, chickenpox, herpes zoster, mononucleosis, syphilis, tuberculosis, cryptococcosis, and sarcoidosis among secondary causes. Tintinalli’s Emergency Medicine, optic neuritis section.

4. Neoplastic and paraneoplastic causes

  • Paraneoplastic optic neuropathy/neuritis, classically anti-CRMP5-associated, often subacute, painless, and bilateral
  • Leukemia, lymphoma, or other infiltrative malignancy
  • Leptomeningeal metastasis

Important mimics to exclude

These may cause bilateral visual loss or normal-appearing discs but are not true retrobulbar optic neuritis:
  • Papilledema due to raised intracranial pressure
  • Toxic or nutritional optic neuropathy
  • Compressive optic neuropathy
  • Giant-cell arteritis or other ischemic optic neuropathy
  • Severe hypertension
High-yield exam answer: NMOSD, MOGAD, MS, SLE, Sjögren syndrome, sarcoidosis, syphilis, tuberculosis, viral/postviral disease, postvaccination disease, and paraneoplastic optic neuropathy.
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