Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is an ill - defined opacity occupying the left mid lung , corresponding to the area of concern on the most recent portable chest radiograph from ___ . The right hemithorax remains clear . The cardiomediastinal and hilar contours are within normal limits . There is no pleural effusion or pneumothorax pain
    OUTPUT:
    
Ill - defined opacity occupying the left mid lung , corresponding to the area of concern on the most recent portable chest radiograph from ___ and new as compared to chest radiograph from ___ . Given provided history , findings could reflect an area of pulmonary infarct secondary to a PE . Chest CTA has already been ordered to further evaluate . In the appropriate clinical setting , these findings could also a reflect an infectious process such as pneumonia . Short interval followup recommended upon conclusion of treatment to document resolution .