Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size appears borderline enlarged , likely accentuated due to low lung volumes . Mediastinal and hilar contours are unremarkable with mild atherosclerotic calcifications noted at the aortic knob . Pulmonary vasculature is normal . Patchy opacities are demonstrated in the lung bases likely reflective of atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . No acute osseous abnormalities demonstrated .
    OUTPUT:
    
Low lung volumes with bibasilar patchy opacities likely atelectasis .