Few streaks in the lower lobes of both lungs are linear, dense images of 1 to 2 streaks, short in length, in each of the lower lobes of both lungs found on chest CT, which are fibrous scar tissue in the lungs left behind after the inflammation in the lungs has absorbed and subsided. 1. Inflammatory reaction of lung infectious diseases can lead to alveolar injury and interstitial composition changes in the lung fibrosis, if the inflammatory reaction is mild, a small amount of unabsorbed pulmonary fibrosis scar tissue can be left behind after healing of the lesion, forming a short, thin, line-like silhouette. 2. A small amount of striae in the lower lobes of both lungs has no effect on the body and does not require follow-up treatment. 3. In the early stage of idiopathic interstitial fibrosis, there may be a small striated shadow in the lower lobes of both lungs on CT examination, so pay attention to regular review. If the patient has a combination of symptoms such as chest tightness, it is recommended to go to the hospital in time.