Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear platelike atelectasis in the left lower lung with similar to exam earlier on the same date . Opacity just medial to this is overall unchanged and does not have the typical appearance of pneumonia on the lateral view - maybe some atelectasis . The right lung is clear . No pneumothorax . Small left pleural effusion . The heart is normal in size . The mediastinum is not widened . The hila are within normal limits .
    OUTPUT:
    
Small left pleural effusion . No convincing radiographic evidence for pneumonia .