HRCT and pathological findings in the patients who developed CVD and in those with IPF at the time of initial diagnosis.

HRCT, high-resolution computed tomography; CVD, connective vascular disease; IPF, idiopathic pulmonary fibrosis; CVD-IP, interstitial pneumonia associated with collagen vascular disease; GGO, ground-glass opacity; n. s., not significant.*scoring of the severity: absent 0, mild 1, moderate 2 and marked 3.