Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacemaker device with leads terminating in the right atrium and right ventricle is again noted . There is mild cardiomegaly . The aorta remains tortuous with mild atherosclerotic calcifications . Enlargement of the hila bilaterally is compatible with known pulmonary arterial hypertension . No pulmonary edema is identified . Linear opacities in both lung bases are compatible with subsegmental atelectasis . No pleural effusion or pneumothorax is identified . Diffuse demineralization of the osseous structures with multilevel degenerative changes are present in the thoracic spine .
    OUTPUT:
    
Bilateral hilar enlargement compatible with known pulmonary artery hypertension . Bibasilar linear atelectasis .