Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are compared to portable exam from earlier the same day and chest x-ray from ___ . New from prior exam is retrocardiac opacity confirmed on the lateral view . Elsewhere , the lungs are clear . There is no effusion . Cardiac silhouette is enlarged , not significantly changed from prior exam in ___ . There are enlarged pulmonary hila bilaterally as seen on prior portable exam . Osseous and soft tissue structures are unremarkable .
    OUTPUT:
    
1 . Left lower lobe opacity which could be compatible with pneumonia in the proper clinical setting . Repeat exam suggested after treatment to document resolution . 2 . Enlarged pulmonary hila bilaterally . This can be due to pulmonary artery enlargement in the setting of pulmonary hypertension however this may also be due to hilar adenopathy . CT scan with contrast suggested to further characterize .