Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs . Top normal size of the heart , unchanged from prior chest radiographs . A left pectoral dual - chamber pacer is again noted . There is no focal consolidation , pleural effusion , or pneumothorax . Low lung volumes causes crowding of the bronchovascular structures , but no frank pulmonary edema is present . Atherosclerotic calcifications are again noted in the aortic arch . Severe degenerative changes are partially imaged in the upper lumbar spine .
    OUTPUT:
    
No acute cardiopulmonary process .