Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The heart size is mildly enlarged , but accentuated due to low lung volumes . Mediastinal and hilar contours are unchanged . There is no pulmonary edema . Streaky and linear opacities in the lung bases are compatible with areas of atelectasis . Minimal blunting of the left costophrenic angle suggests a small left pleural effusion , unchanged . There is no pneumothorax . No acute osseous abnormalities identified .
    OUTPUT:
    
Bibasilar atelectasis and trace left pleural effusion , similar compared to the prior exam .