Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is mildly enlarged . The aorta is mildly tortuous and demonstrates mild atherosclerotic calcifications . Enlargement of the pulmonary arteries is re - demonstrated . There is crowding of the bronchovascular structures . Patchy bibasilar airspace opacities likely reflect atelectasis . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Patchy bibasilar airspace opacities likely reflect atelectasis in the setting of low lung volumes . Enlargement of pulmonary arteries suggestive of underlying pulmonary arterial hypertension .