Rheumatoid Arthritis-Associated Orbital Vasculitis.

Area of Science:

• Rheumatology
• Ophthalmology
• Pathology

Background:

• A patient with rheumatoid arthritis on abatacept developed bilateral orbital lesions.
• Initial biopsies revealed vasculitis with eosinophilic infiltration.

Observation:

• A patient with RA on abatacept developed bilateral orbital lesions with eosinophilic vasculitis on biopsy.
• Initial cyclophosphamide treatment showed transient improvement, followed by disease progression and systemic involvement.
• Serologic studies revealed eosinophilia and elevated rheumatoid factor, without other specific markers.

Findings:

• A second biopsy confirmed eosinophilic vasculitis, ruling out granulomatosis with polyangiitis (GPA).
• High-dose mycophenolate mofetil therapy led to near-complete resolution of orbital and systemic lesions within one year.
• The patient's presentation and treatment response were inconsistent with typical GPA.

Implications:

• This case underscores the diagnostic difficulties in orbital vasculitis, especially in immunosuppressed patients.
• It emphasizes the need to avoid premature categorization of vasculitis with unclear etiology under diagnoses like GPA.
• An open diagnostic and therapeutic approach is crucial for managing complex vasculitic syndromes and achieving favorable patient outcomes.