Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The study is limited due to body habitus and positioning . Lung volumes are low accounting for bronchovascular crowding . Bibasilar streaky opacities suggest atelectasis . Increased interstitial opacities are seen , but there are no focal opacities suggestive of pneumonia . Cardiac size is moderately enlarged , although assessment is limited due to low lung volumes and AP projection . Mitral anular calcifications are redemonstrated . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Low lung volumes . Interstitial edema but no definite evidence of pneumonia .