Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided pacemaker with leads terminating in the right atrium , right ventricle and coronary sinus remain in unchanged position . The heart remains moderately enlarged . Increased density at the right lung base is not clearly identified on the lateral view and may be partially due to overlying soft tissue , pulmonary edema and atelectasis . However an underlying infectious process can not be entirely excluded . There is a there is mild to moderate interstitial pulmonary edema . No pleural effusion or pneumothorax identified .
    OUTPUT:
    
1 . Moderate cardiomegaly and interstitial pulmonary edema . 2 . Hazy opacity in right lower lung is at least partially accounted for by right chest wall deformity related to old injury . If clinical suspicion for infectious pneumonia persists , short - term followup radiograph may be helpful to exclude superimposed pulmonary infection in this region .