Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since prior exam , the lung volumes are lower . The chest remains hyperinflated with flattening of the diaphragms . There is a diffuse non-specific interstitial abnormality , not significantly changed from the prior exam . There is no focal air space opacity , pulmonary edema , pleural effusion , or pneumothorax . The mediastinal contours are normal . Allowing for technique , the heart size is at the upper limits of normal .
    OUTPUT:
    
Unchanged diffuse non-specific interstitial abnormality which could be due to mild vascular congestion or chronic emphysema / asthma . No new opacity to suggest pneumonia .