Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate the lungs are well expanded and clear . The cardiomediastinal silhouette is unremarkable . There is no pleural effusion , pneumothorax , pulmonary edema , or focal airspace consolidation . Persistent tracheal narrowing is noted , with slight rightward deviation of the trachea , and right paratracheal thickening , unchanged compared to multiple prior studies , dating back to ___ . Right basilar bronchial wall thickening is likely due to underlying bronchiectasis or bronchitis , with a small amount of resulting atelectasis .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Persistent tracheal narrowing with slight rightward deviation , possibly due to tracheomalacia or " saber - shaped " trachea due to underlyng chronic obstructive pulmonary disease . Further evaluation for tracheomalacia could be obtained with inspiratory and expiratory chest CT .