Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright frontal view of the chest . A dual - chamber cardiac pacer is present . There is moderate cardiomegaly , and an unfolded , slightly tortuous aorta . There are coarse increased interstitial markings throughout both lung bases , consistent with mild interstitial edema . There is no overt pulmonary edema . Kerley B lines are noted and could reflect chronic CHF . Increased retrocardiac density may represent a combination of atelectasis and CHF findings . No definite focal consolidation . No pleural effusion or pneumothorax is detected . Incidental note made of soft tissue anchor over left humeral head .
    OUTPUT:
    
Moderate cardiomegaly and mild interstitial edema .