Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no pleural effusion , pneumothorax or focal airspace consolidation . Linear atelectasis is seen in the lung bases , on the lateral view only . There is no evidence for " crack lung . " The heart size is normal . The hilar structures and mediastinal contours are unremarkable . There is no free air seen under in the diaphragm or within the mediastinum .
    OUTPUT:
    
No acute cardiopulmonary process .