Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size remains mildly enlarged . The aortic knob is calcified . Enlargement of the main pulmonary artery and both hila are compatible with the provided history of pulmonary arterial hypertension . No pulmonary edema is noted . Patchy opacities are seen in the right lung base . No focal consolidation , pleural effusion or pneumothorax is present . No acute osseous abnormalities seen .
    OUTPUT:
    
1 . Patchy bibasilar atelectasis . 2 . Enlargement of the hila bilaterally compatible with the history of pulmonary arterial hypertension . 3 . Minimal patchy right basilar opacity could reflect atelectasis . Infection is not excluded in the correct clinical setting .