Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . There is no pulmonary vascular congestion . The hilar and mediastinal contours are unremarkable . Linear opacities in the lingula and left lower lobe are compatible with subsegmental atelectasis . Remainder of the lungs are clear without evidence of focal consolidations concerning for pneumonia . There is no pleural effusion or pneumothorax . The visualized osseous structures are unremarkable .
    OUTPUT:
    
Left basilar subsegmental atelectasis . No acute intrathoracic process otherwise identified .