Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrate streaky opacity in the left lung base thought likely sequela of atelectasis . No opacity convincing for pneumonia is seen . Cardiomediastinal and hilar contours are stable . There is mild cardiomegaly . No evidence of pulmonary edema . There is no pneumothorax or pleural effusion . There is no air under the right hemidiaphragm .
    OUTPUT:
    
Left lung base atelectasis . No evidence of pneumonia . Mild cardiomegaly .