Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable AP chest radiograph was provided . Lungs are well expanded . They appear hyperlucent with increased reticulation , likely representing emphysema . No large focal consolidation , pleural effusion , or pneumothorax . Retrocardiac opacities are incompletely evaluated and may be normal but difficult to evaluate on this single projection . There are calcifications of the aorta . The bones are osteopenic .
    OUTPUT:
    
Findings consistent with emphysema . Retrocardiac opacities may be normal , but is difficult to evaluate on this single projection . If there is clinical concern for pneumonia , a lateral projection may be helpful .