Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac and mediastinal contours are within normal limits . Apparent enlargement of the left hilum is likely due to mild enlargement of the left lower lobe pulmonary artery due to pulmonary embolism as demonstrated on CT . Focal opacity within the left lower lobe is compatible with infarction . Streaky opacity in the right lower lobe may reflect an additional site of developing infarction or atelectasis . Small left pleural effusion is noted . No pneumothorax is identified . Mild degenerative changes are present in the thoracic spine .
    OUTPUT:
    
1 . Apparent left hilar enlargement likely reflects mild enlargement of the left lower lobes pulmonary artery due to known embolism . 2 . Left lower lobe opacity compatible with infarction . Small left pleural effusion . 3 . Streaky right lower lobe opacity may reflect atelectasis or additional site of developing infarction .