Pulmonary lamellar faint shadows represent the imaging pathology of both lungs as described by radiographs, CT or MRI. Clinically, it can be seen in diseases of the respiratory system, such as bronchitis, bronchopneumonia, tuberculosis, bronchiectasis combined with infection from various causes, diffuse interstitial pulmonary fibrosis from various causes or idiopathic, pulmonary protein deposition, silicosis, pneumoconiosis, radiation pneumonia, and respiratory distress syndrome from various causes; and also in some diseases of the cardiovascular system, such as acute pulmonary edema from various causes of acute pulmonary edema due to left heart failure.