Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a normal cardiomediastinal silhouette and hyperinflated lungs . Retrocardiac bronchial wall thickening and air bronchograms are unchanged compared to ___ , and likely represent chronic bronchitis . There is no focal consolidation , pleural effusion , or pneumothorax . Apical pleural thickening is noted bilaterally . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
Retrocardiac opacity is likely chronic bronchitis , without evidence of acute pneumonia .