Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is within normal limits . Osseous structures are unremarkable . No evidence of pleural effusion or pneumothorax . Dense soft tissue opacification in the left chest related to recent breast surgery likely accounts for hazy increased opacity in the left mid and lower lung regions . A small air - fluid level in the left breast anteriorly is probably postoperative .
    OUTPUT:
    
Dense soft tissue opacification in the left chest related to recent breast surgery likely accounts for hazy increased opacity in the left mid and lower lung regions . If clinical suspicion for infection persists , short - term followup radiographs may be helpful to fully exclude pneumonia in this region .