Striated lesions in the lower lobe of the right lung are usually considered to be residual foci of lung inflammation, tuberculosis, or underlying lesions such as interstitial lung disease. 1. Remaining foci: If the patient has a history of lung diseases such as tuberculosis or viral pneumonia in the lower lobe of the right lung, and the inflammation has not been absorbed properly or the tuberculosis calcification has not recovered completely after normal treatment, it will cause the right lower lobe of the right lung to be cordate. 2. Underlying disease: When the presence of obvious disease cannot be determined by CT or chest radiographs alone, the patient may have undetected lung diseases such as interstitial pneumonia. In conclusion, the causes of right lower lobe striae are complex, and patients should seek medical attention in a timely manner and cooperate in differential diagnosis under the guidance of specialized doctors.