Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient has multiple known pulmonary metastases , which are better assessed on the recent CT chest performed ___ . Streaky left retrocardiac opacities likely represent atelectasis , although pneumonia is difficult to exclude in the appropriate clinical setting . No other consolidation . No pleural effusion or pneumothorax . Thoracic aorta is tortuous . Heart size is normal . There is no subdiaphragmatic free air .
    OUTPUT:
    
1 . Left retrocardiac opacity may represent atelectasis or pneumonia . 2 . Known pulmonary metastases .