Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is slightly rotated . New pneumomediastinum is present with extensive subcutaneous emphysema tracking into the neck and chest wall bilaterally . Assessment for pneumothorax is somewhat limited given the presence of extensive subcutaneous emphysema , though no large pneumothorax is detected . Lung volumes remain low with coarse interstitial opacities noted diffusely compatible with history of severe fibrosing chronic lung disease . Heart size remains mildly enlarged with a small hiatal hernia again noted . Mediastinal and hilar contours are unchanged with crowding of bronchovascular structures and increased interstitial opacities compared to the previous chest radiograph suggestive of mild pulmonary vascular congestion . There is no shift of mediastinal structures . Increased airspace opacities within the lung bases may reflect areas of atelectasis . Retained barium is noted within multiple diverticula in the left upper quadrant of the abdomen .
    OUTPUT:
    
1 . New extensive pneumomediastinum and subcutaneous emphysema . 2 . Assessment for pneumothorax is limited , though none is clearly identified . 3 . Increased interstitial alveolar opacities may reflect mild pulmonary congestion or active inflammation or infection superimposed on a background of severe fibrosing chronic lung disease .