Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest ___ inspiratory lung volumes . A basilar opacity in the left lung is consistent with left lower lobe atelectasis . No pleural effusion , pulmonary edema or pulmonary vascular congestion is present . There is no pneumothorax . The cardiac silhouette is top normal in size given the low lung volumes . The patient is status post median sternotomy with wires intact . Extensive degenerative changes of the thoracic spine are noted .
    OUTPUT:
    
Left lower lobe atelectasis in the setting of low lung volumes . No evidence of fluid overload or pneumonia .