Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The patient is status post CABG with sternotomy wires and mediastinal clips that are intact and in similar position to ___ . Right IJ central line terminates in the low svc . New left uppe zone ill - defined opacity may represent atelectasis , but infection or aspiration can not be excluded in the appropriate clinical stetting . Bilateral pleural effusions , left greater than right are similar to prior . Cardiomediastinal silhouette is stable .
    OUTPUT:
    
Ill - defined left upper zone new opacity , compatible with atelectasis , although in the correct clinical setting , infection or aspiration can not be excluded .