Interstitial lung disease, also known as diffuse parenchymal lung disease, comprises a broad group of acute and chronic conditions, some of which have known causes and others whose cause remains to be determined. The most common of these conditions are idiopathic pulmonary fibrosis, sarcoidosis, hypersensitivity pneumonitis, and interstitial lung diseases associated with collagen vascular diseases. Although plain-film chest X-rays remain useful in the diagnosis of these diseases, they are difficult to interpret and have low diagnostic sensitivity. Thus, high-resolution computed tomography (CT) is the technique of choice for their diagnosis.The definitive diagnosis of interstitial lung disease should be reached through a consensus among clinicians, radiologists, and pathologists, so the radiology report is an essential part of the diagnostic process. The report must be clear and succinct, providing basic information including the imaging findings, the differential diagnosis, and, when necessary, information about the most appropriate lung areas for biopsy.We review the role of the radiological report in interstitial lung disease, including the structured report.