Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A new interstitial pulmonary abnormality predominantly in the right lung has little basal predominance . Increased prominence of the pulmonary vasculature is suggestive of elevated left atrial pressure , but not generalized volume overload . Right hilar enlargement could be nodal or vascular . An area of linear scarring in the left lower hemithorax is unchanged . The heart size is top normal .
    OUTPUT:
    
Active interstitial pneumonia , hemorrhage , or drug reaction , more likely than edema , but not certain . Possible right hilar adenopathy . If patient is immunocompromised , pneumocystis should be considered . Dr ___ and I discussed these findings at 8 : 15 AM .