Interstitial lung disease

HRCT: high-resolution computed tomography; ILD: interstitial lung disease; BAL: bronchoalveolar lavage; UIP: usual interstitial pneumonia; IPF: idiopathic pulmonary fibrosis; NSIP: nonspecific interstitial pneumonia; OP: organizing pneumonia; PLCH: pulmonary Langerhans cell histiocytosis; TBB: transbronchial lung biopsy.

* Serology as indicated by clinical findings: rheumatoid factor, anticyclic citrulinated peptide, antinuclear antibody, antisynthetase antibodies, creatine kinase, aldolase, Sjögren antibodies and scleroderma antibodies.

1. Reticular opacities in basal and peripheral distribution.
2. Traction bronchiectasis.
3. Honeycombing (clustered airspaces 3 to 10 mm diameter) in subpleural location.
4. Ground-glass opacities may be present but are less extensive than reticular opacities.