Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacemaker device is noted with leads terminating the right atrium and right ventricle . The patient is status post median sternotomy and aortic valve replacement . Heart size remains severely enlarged . The aorta is tortuous and calcified at the aortic arch . Pulmonary vasculature is not engorged . Lungs are hyperinflated . Patchy opacities are seen within both lung bases , likely atelectasis . Calcified granuloma in the right upper lobe is unchanged . No focal consolidation , pleural effusion or pneumothorax is identified . Osseous structures are diffusely demineralized with compression deformities of 2 adjacent vertebral bodies at the thoracolumbar junction appearing unchanged .
    OUTPUT:
    
Patchy bibasilar opacities , likely atelectasis .