Primary Sjögren's syndrome (pSS) is a chronic autoimmune disease characterized by exocrinopathy, with an estimated prevalence of 0.33%-0.77% in China and 0.06% worldwide. 1,2 pSS patients primarily suffer from xerophthalmia and xerostomia and 30%-40% of pSS patients present extra-glandular manifestations including arthritis, nephritis, and neuropathy. 3 Interstitial lung diseases (ILD) are a group of heterogeneous inflammatory and fibrotic pulmonary parenchymal disorders, which are frequently complicated in connective tissue diseases. 4,5 ILDs are diagnosed based on clinical presentations, high-resolution computed tomography (HRCT), pulmonary function test (PFT), and lung biopsy. 6,7 HRCT is a sensitive diagnostic tool for ILD, and is strongly correlated with pulmonary histology and PFT, with nonspecific interstitial pneumonia (NSIP), usual interstitial pneumonia, lymphoid interstitial pneumonia, organizing pneumonia, and bronchiolitis as the most common HRCT patterns in pSS patients. 8,9 Interstitial lung diseases is a poor prognosis factor and accounts for one-tenth of deaths in pSS patients. 10,11 However, the reported prevalence of ILD in pSS patients varies significantly, ranging from 1.5% to 78%. 9,12 Furthermore, the risk factors for ILD in pSS patients