Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low with crowding of the pulmonary vasculature . However , the vasculature is somewhat indistinct suggesting a component of mild interstitial edema . Patchy opacities at both bases may reflect atelectasis , although aspiration or pneumonia should also be considered . No pleural effusion or pneumothorax . Moderate cardiomegaly is essentially stable allowing for differences in lung volumes .
    OUTPUT:
    
Bibasilar opacities may reflect atelectasis in the setting of low lung volumes although pneumonia can not be excluded . Probable superimposed mild interstitial edema .