Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP upright portable view of the chest was obtained . The patient is status post median sternotomy and CABG . At least two of the sternal wires are fractured . Medial left side vascular stent is again seen . There has been interval removal of a right - sided PICC . Mild bibasilar atelectasis persists but appears somewhat improved . Again seen is an opacity projecting over the left upper hemithorax , to the left of the aortic knob , likely representing summation of shadows , including the anterior aspect of the left first rib . No large pleural effusion or evidence of pneumothorax is seen . The cardiac silhouette is top normal . The aorta is calcified .
    OUTPUT:
    
1 . Basilar atelectasis is again seen . 2 . Interval decrease in previously seen pleural effusions .