Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest ___ inspiratory lung volumes . The lungs are clear without large pleural effusion , focal consolidation or pneumothorax . The pulmonary vasculature is not engorged . The cardiomediastinal silhouette is stable from the preceding radiograph of ___ . Bibasilar atelectasis is expected in the setting of low lung volumes . The aortic knob is partially calcified with an unfolded thoracic aorta . The patient is status post median sternotomy with wires appearing intact .
    OUTPUT:
    
No evidence of acute heart failure . No pneumonia .