Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest are compared to previous exam from ___ . Linear opacities again seen in the left mid lung laterally suggestive of scarring as they were seen on the previous exam . The lungs are otherwise clear without consolidation or pulmonary vascular congestion . There is no effusion . Cardiomediastinal silhouette is within normal limits . Prior median sternotomy changes are noted . Osseous and soft tissue structures are grossly unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .