Ocular manifestations in patients with microscopic polyangiitis
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Updated: Aug 12, 2026

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Published on: January 12, 2022
M Mihara1, S Hayasaka, K Watanabe
1Department of Ophthalmology, Toyama Medical and Pharmaceutical University, Toyama - Japan. ophthal@ms.toyama-mpu.ac.jp
Purpose:
To describe ocular manifestations in patients with microscopic polyangiitis.
Methods:
Two patients with microscopic polyangiitis complained of ocular symptoms and underwent ophthalmologic examinations.
Results:
An 83-year-old woman (Case 1) was diagnosed with microscopic polyangiitis, according to the general clinical findings and the presence of perinuclear pattern of antineutrophil cytoplasmic antibodies (P-ANCA). She had hypopyon iridocyclitis in the right eye and retinal cotton-wool spots in the left eye. The patient was treated with oral prednisolone and subconjunctival betamethasone. The hypopyon iridocyclitis and retinal cotton-wool spots responded. A 79-year-old man (Case 2) had bilateral scleritis. The diagnosis of microscopic polyangiitis was made based on general clinical findings and the presence of P-ANCA. Scleritis was reduced after corticosteroid treatment.
Conclusions:
Ophthalmologists should be aware that hypopyon iridocyclitis, cotton-wool spot, and scleritis could occur in patients with microscopic polyangiitis.
Insights
Microscopic polyangiitis can cause serious eye conditions like hypopyon iridocyclitis, cotton-wool spots, and scleritis. Early recognition by ophthalmologists is crucial for timely treatment and better patient outcomes.
Area of Science:
- Ophthalmology
- Rheumatology
- Internal Medicine
Background:
- Microscopic polyangiitis (MPA) is a rare autoimmune vasculitis.
- Ocular involvement in MPA is not well-documented.
- Understanding these manifestations is key for early diagnosis and management.
Observation:
- This study reports on two patients diagnosed with microscopic polyangiitis.
- Patient 1 presented with hypopyon iridocyclitis and retinal cotton-wool spots.
- Patient 2 exhibited bilateral scleritis.
Findings:
- Both patients had positive perinuclear antineutrophil cytoplasmic antibodies (P-ANCA).
- Ocular symptoms in both cases responded to corticosteroid therapy.
- Hypopyon iridocyclitis, cotton-wool spots, and scleritis are potential ocular manifestations of MPA.
Implications:
- Ophthalmologists should consider MPA in patients presenting with these specific ocular findings.
- Prompt diagnosis and treatment of MPA can prevent vision loss.
- This case series highlights the importance of a multidisciplinary approach in managing MPA.
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