Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation , pleural effusion or pneumothorax . The pulmonary vasculature is not engorged . The cardiac silhouette is normal in size . The mediastinal and hilar contours are within normal limits . The trachea is midline ; however , there is slight right - sided compression of the upper trachea compared to the prior ___ study . No acute osseous abnormality is detected .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Slight right - sided compression of the upper trachea compared to ___ . A non-urgent followup neck radiograph is recommended to determine if this is related to patient positioning .