Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A poorly defined opacity at the left lung base may represent a developing infectious process . The lungs are otherwise clear and the cardiomediastinal contour is normal apart from being slightly rotated . No pleural effusion or pneumothorax .
    OUTPUT:
    
Poorly defined opacity at the left lung base may represent a developing infectious process . Short - term followup radiographs after appropriate treatment are recommended to ensure resolution