Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are hyperinflated with flattening of the diaphragms . Tracheostomy tube is identified . There is persistent relatively streaky left basilar opacity . This may correlate with a linear opacity projecting over the fissure on the lateral view and could represent atelectasis or scarring . Elsewhere , the lungs are clear . Cardiomediastinal silhouette is stable , atherosclerotic calcifications are noted at the aortic arch . No acute osseous abnormalities .
    OUTPUT:
    
Left basilar opacity most likely atelectasis or scarring . No definite superimposed cardiopulmonary process .