Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A linear opaque structure projects over the left hemi thorax . There is linear lateral left base atelectasis . No definite focal consolidation is seen . There is no large pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are unremarkable . No pulmonary edema is seen .
    OUTPUT:
    
Linear left lateral base opacity most likely represents atelectasis , much less likely pneumonia .