Rheumatoid lung disease as seen on PET/CT scan.

Area of Science:

• Rheumatology
• Pulmonology
• Radiology

Background:

• Rheumatoid arthritis (RA) is a chronic autoimmune disease that can affect multiple organs, including the lungs.
• Rheumatoid lung disease encompasses a spectrum of pulmonary manifestations, such as interstitial lung disease, nodules, and pleural effusions.
• Chronic smoking is a significant risk factor for both RA and various lung pathologies.

Observation:

• A 63-year-old female chronic smoker with severe rheumatoid arthritis presented with dyspnea and cough.
• Imaging revealed multiple lung nodules and a left pleural effusion.
• PET/CT scan showed no uptake in lung nodules but intense uptake in the left pleura, raising suspicion for both rheumatoid lung disease and malignancy.

Findings:

• CT-guided lung and pleural biopsy confirmed rheumatoid lung disease with pleural involvement.
• The diagnostic challenge lay in differentiating rheumatoid nodules from lung cancer, especially with pleural effusion.
• Absence of significant PET uptake in lung nodules, contrasted with pleural uptake, supported a rheumatologic etiology.

Implications:

• This case underscores the importance of considering rheumatoid lung disease in RA patients presenting with respiratory symptoms and pulmonary findings.
• Early diagnosis and initiation of immunomodulatory therapy are crucial for managing rheumatoid lung disease and improving patient outcomes.
• The findings emphasize the role of multimodal diagnostic approaches, including advanced imaging and biopsy, in complex cases.