Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral chest radiographs demonstrate low lung volumes and patchy retrocardiac opacities . There is no large pleural effusion or pneumothorax . Atherosclerotic calcifications are seen throughout the aorta . The heart size is normal . The right hilum is not well seen but has a rounded contour .
    OUTPUT:
    
1 . Patchy retrocardiac opacities may represent atelectasis , less likely infection . Evaluation with PA and lateral views may be helpful . 2 . Right hilar contour of mild prominence , probably normal , but comparison to old images if available or repeat chest radiographs is recommended to reassess given the limitations of AP technique .