Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Two portable frontal views of the chest initially show a consolidation within the left lung which immediately clears on repeat imaging , suggesting atelectasis . There is no pleural effusion or pneumothorax . The lung volumes are low , which accentuates the bronchovascular structures . The cardiac and mediastinal contours are unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .