Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low bilaterally . Linear opacity in the left lung base , likely represents platelike atelectasis . There is a small left - sided pleural effusion . There are no focal consolidations or pneumothorax . The hila , mediastinum , and heart are within normal limits . Also noted is chronic elevation of left hemidiaphragm . No acute osseous abnormalities .
    OUTPUT:
    
1 . Platelike atelectasis of left lung base 2 . Small left pleural effusion .