Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . The lungs are clear where not obscured by overlying stimulator device on the left chest . The cardiomediastinal silhouette is within normal limits . Degenerative changes seen at the acromioclavicular joints .
    OUTPUT:
    
No definite acute cardiopulmonary process .