Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph again demonstrates intact sternotomy wires and a radiopaque focus projecting over the SVC , unchanged . Cardiac size remains top - normal to mildly enlarged . There is again bibasilar atelectasis , but no confluent consolidation . There is mild vascular plethora without overt CHF . Overall , the appearance is similar to the prior study . No appreciable pleural effusion or pneumothorax is seen .
    OUTPUT:
    
No definite acute cardiopulmonary process .