Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low which results in limited evaluation of the lung bases . Bibasilar airspace opacities likely reflect atelectasis . Heart size is unchanged and within normal limits . The mediastinal and hilar contours are similar , with prominence of the pulmonary artery suggestive of underlying pulmonary arterial hypertension as noted previously . There is crowding of the bronchovascular structures . No pleural effusion or pneumothorax is detected .
    OUTPUT:
    
Limited study due to low lung volumes . Bibasilar airspace opacities likely reflect atelectasis . Consider follow up radiographs with improved inspiratory effort when the patient is able to .