Background: Interstitial lung diseases are heterogeneous group of disorders of the lower respiratory tract that are characterized by both acute and chronic inflammation and a generally irreversible and relentless process of fibrosis in the interstitium and the alveolar walls. High-resolution computed tomography of the chest has become an invaluable tool in the diagnostic process of interstitial lung diseases. Present study was aimed to study characteristics of interstitial lung disease using HRCT in clinically suspected cases.