Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear opacities at the lung bases , left greater than right are unchanged from prior and may be due to scarring versus atelectasis , similar compared to prior chest CT . Right midlung linear opacity likely due to scarring . There is no large effusion or overt pulmonary edema . The cardiomediastinal silhouette is stable . Anterior cervical fixation hardware and prior right rib fractures are noted .
    OUTPUT:
    
No acute cardiopulmonary process .