Patchy hyperdense shadows in both lungs are mostly fibrous lesions in the lungs, which are mostly considered after healing of tuberculosis, chronic bronchitis, and so on. Fibrous lesions refer to chronic inflammatory or proliferative lesions in the lungs, in the process of repair and healing, the fibrous component gradually replaces the cellular component and forms a scar. Striated shadows are more common, and a larger range of fibrosis often forms patchy, striated or blocky high-density shadows, with a more irregular pattern. Fibrosis can cause respiratory subbronchial airspace enlargement and bronchiectasis. Fibrotic lesions can be divided into two categories: limited and diffuse; the former is often a consequence of the healing of chronic pneumonia and tuberculosis; the latter is commonly caused by chronic bronchitis, rheumatoid, pneumoconiosis (pneumoconiosis), and scleroderma. Patchy hyperdense shadows in both lungs can also be seen in other diseases, and it is recommended that patients seek timely medical treatment to avoid delaying their condition.