Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild prominence of interstitial markings bilaterally suggests component of minimal edema . There are bibasilar opacities which could be due to infection , or aspiration . The cardiac and mediastinal silhouettes are grossly unremarkable . No large pleural effusion is seen although a trace left pleural effusion be difficult to exclude . The aorta is calcified and tortuous . No pneumothorax is seen .
    OUTPUT:
    
Slight prominence of the interstitial markings bilaterally could be due to mild interstitial edema . Superimposed bibasilar opacities , could be due to aspiration or infection , underlying chronic lung disease not excluded .