Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . There is status post sternotomy . The presence of multiple surgical clips in the anterior left - sided mediastinum are indicative of previous bypass surgery . Heart size is not significantly enlarged . No pulmonary vascular congestive pattern is identified . No evidence of acute or chronic pulmonary infiltrates is present and the lateral and posterior pleural sinuses are free . No pneumothorax in the apical area .
    OUTPUT:
    
On previous chest examination suggested basal infiltrates can not be verified . Pulmonary parenchyma is presently clear and the chest findings are unremarkable in this patient with evidence of previous bypass surgery .