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A case of IgG4-related optic neuropathy resulting in sudden visual impairment Nianchun Lue 1 , Tsubasa Komori 1 , Satoko Asaoka 1 , Toshihiko Ohta 1 , Shintaro Nakao 2 1Department of Ophthalmology, Juntendo University Shizuoka Hospital 2Department of Ophthalmology, Juntendo University School of Medicine pp.979-986
Published Date 2026/8/15
DOI https://doi.org/10.11477/mf.037055790800080979

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Abstract Purpose:IgG4-related eye disease is characterized by lacrimal gland enlargement, trigeminal nerve enlargement, and extraocular muscle enlargement. IgG4-related optic neuropathy is a rare condition involving the optic nerve and is classified as a subtype of IgG4-related eye disease, causing visual impairment and visual field defects. We report a case of IgG4-related optic neuropathy presenting with sudden visual acuity decline and visual field defects.

Case:A 75-year-old male receiving topical medication for normal-tension glaucoma presented with the rapid onset of visual acuity and visual field impairment. Orbital contrast-enhanced magnetic resonance imaging revealed compressive optic neuropathy and bilateral enlargement of the infraorbital nerves. Enlarged lacrimal glands, marked lymphocytic and plasma cell infiltration on histopathologic examination, and hyper-IgG4-hemoglobinemia(4,040 mg/dL) led to a definitive diagnosis within the spectrum of IgG4-related ocular disease. Steroid pulse therapy was administered, followed by maintenance therapy with prednisolone(PSL) at 1.0 mg/kg/day. As symptom improvement was limited, tacrolimus and methotrexate(MTX) were also initiated. Maintenance therapy is ongoing with PSL 1 mg, tacrolimus 3 mg, and MTX 8 mg. Following treatment, visual acuity in the right eye improved;however, a central scotoma persists in both eyes.

Conclusion:In cases in which markedly elevated serum IgG4 levels(≧1,000 mg/dL) cause optic neuropathy, irreversible visual field defects may persist. When recurrence occurs or treatment is refractory, combination therapy with immunosuppressants and biologic agents has been reported to be effective. Furthermore, bilateral trigeminal nerve enlargement strongly suggests IgG4-related eye disease and is useful for guiding systemic evaluation and treatment strategies.


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電子版ISSN 1882-1308 印刷版ISSN 0370-5579 医学書院

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