Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post left upper lobectomy with clips noted in the left hilar region . There is unchanged leftward shift of the mediastinal structures with left sided volume loss . There is focal opacification within the left mid lung field , which could reflect an area of pneumonia though recurrent malignancy is not excluded . Blunting of the left costophrenic sulcus is unchanged compatible with a small pleural effusion , similar to prior . There is no pulmonary vascular congestion . The right lung is clear . Cardiac and mediastinal contours are unchanged with a small hiatal hernia re - demonstrated . No acute osseous abnormalities seen .
    OUTPUT:
    
Focal opacification within the left mid lung field concerning for pneumonia , but recurrent malignancy is not excluded . Recommend followup radiographs after treatment to assess for interval resolution .