Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There has been an interval increase in the interstitial markings diffusely bilaterally , which may be due to moderate interstitial edema or atypical infection . The lungs remain hyperinflated with flattening of the diaphragm , consistent with chronic obstructive pulmonary disease . Cardiac and mediastinal silhouettes are stable . Single - lead right - sided pacemaker is again seen , unchanged in position . Patchy left base retrocardiac opacity could relate to the prominent interstitial markings mentioned above , although underlying consolidation from infection and / or aspiration not excluded .
    OUTPUT:
    
Diffusely increased interstitial markings bilaterally , new since the prior study , may be due to pulmonary edema versus atypical infection . Additional left base patchy opacity could relate to the above , although underlying consolidation due to infection or aspiration not excluded .