Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The left pectoral pacemaker leads end in the right atrium , right ventricle , and coronary sinus , unchanged . Moderate cardiomegaly is unchanged . Pulmonary vasculature is less distinct than on the prior study with increased interstitial markings , likely representing mild pulmonary edema . Increased opacity at the right lung base may represent asymmetric edema or developing infection . There may be a tiny right pleural effusion .
    OUTPUT:
    
Findings compatible with mild congestive heart failure . Recommend repeat radiograph after treatment to exclude underlying infection , particularly at the right lung base .