Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a focal opacity at the right lung base . A linear region of opacification at the left lung base most likely represents atelectasis . The lungs are hyperinflated . There is no pleural effusion or pneumothorax . Cardiomediastinal contour is normal . There is dilation of the central pulmonary arteries .
    OUTPUT:
    
1 . Focal opacity at the right lung base concerning for pneumonia , likely bacterial in etiology . 2 . Lung hyperinflation . 3 . Dilation of the central pulmonary artery , which is suggestive of pulmonary artery hypertension and can be seen in the setting of HIV .