Collagen vascular disease-related lung disease: high-resolution computed tomography findings based on the pathologic classification.

Collagen vascular disease (CVD) can cause a variety of lung abnormalities, including usual interstitial pneumonia, nonspecific interstitial pneumonia, organizing pneumonia, diffuse alveolar damage, lymphoid interstitial pneumonia, bronchiectasis, constrictive bronchiolitis, follicular bronchiolitis, alveolar hemorrhage, pulmonary hypertension, and drug-induced lung disease. The frequency of each lung disease is different among underlying CVDs. Although high-resolution computed tomography (HRCT) findings of lung disease are often nonspecific, there are some characteristic HRCT findings for some lung diseases based on pathologic findings.