Ro-positive interstitial lung disease treated with cyclophosphamide

Area of Science:

• Pulmonology
• Rheumatology
• Immunology

Background:

• Interstitial lung disease (ILD) encompasses diverse conditions affecting the alveolar wall, leading to impaired gas exchange.
• Treatment strategies for ILD are contingent upon the specific underlying etiology.
• Community-acquired pneumonia (CAP) can present with symptoms overlapping other respiratory conditions.

Observation:

• A patient initially diagnosed with CAP progressed to type-1 respiratory failure requiring intensive care.
• Standard antimicrobial therapies proved ineffective, necessitating further investigation.
• High-resolution CT revealed diffuse ground-glass opacities and peripheral honeycombing, indicative of fibrosis and alveolitis.

Findings:

• Autoantibody screening identified high titers of anti-SS-A/Ro antibodies.
• The imaging findings and serological results suggested an underlying non-infective inflammatory process.
• The clinical presentation and investigations supported a diagnosis of lung-dominant connective tissue disease.

Implications:

• This case highlights the importance of considering connective tissue diseases in refractory respiratory failure.
• Early identification and management of lung-dominant connective tissue disease can potentially alter disease trajectory.
• The case supports the proposed concept of lung-dominant connective tissue disease in clinical practice.