Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . Known pulmonary nodules are not clearly identified on this plain film as seen on prior chest CT . The lungs are clear . Cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities . Degenerative changes noted at the right acromioclavicular joint .
    OUTPUT:
    
Known pulmonary nodules are not identified on this chest x-ray ; however , followup is suggested per recommendations on prior chest CT from ___ . No acute cardiopulmonary process .