Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left pacer unit sits in the left upper chest wall with leads in the right atrium and right ventricle . The heart size is enlarged , possibly due to exaggerated effects of AP positioning . The mediastinal contours demonstrate calcified atherosclerotic disease of the aorta . The lungs show no consolidation , although vascular prominence and subtle diffuse hazy appearance of the lungs suggests some degree of pulmonary edema , increased since the prior study . There is no pleural effusion or pneumothorax . Imaged lower thoracic vertebral body severe compression is unchanged compared to prior exam .
    OUTPUT:
    
Mild cardiomegaly with mild vascular congestion / pulmonary edema which appears mildly increased compared to prior study , but no definite evidence of pneumonia .