Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate hyperexpanded lungs without pleural effusion , focal consolidations or pneumothorax . Subtle left base opacity is noted . Hilar and mediastinal silhouettes are unremarkable . Heart size is normal . Vascular congestion is noted .
    OUTPUT:
    
Subtle left lung base opacity , may represent early pneumonia , in the appropriate clinical setting . Suggest outpatient CT chest to evaluate for growth of left lung base ground glass opacity seen on CT exam of ___ ( but not on concurrent conventional CXR ) as suggested in that report , in order to evaluate possibility of BAC masquerading as pneumonia . ED QA nurses notified by email of approved text , including recommendation .