Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There are diffuse increased interstitial markings bilaterally , as also seen in prior study . However , on the lateral view they seem slightly more prominent compared to the prior study and I can not exclude an acute - on - chronic process . Mild left base atelectasis / scarring is seen . No pleural effusion or pneumothorax . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Diffuse increased interstitial markings bilaterally seen on the prior study ; the frontal view appears similar to the prior study , although the lateral view suggests possible mild increase in the markings and thus an acute - on - chronic process may be present .