Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are increased mild opacities in the left lower lobe in the retrocardiac region compatible with pneumonia . There is no pneumothorax and no pleural effusion . The mediastinal and cardiac contour are within normal limits . Resolution of the abdominal free air . The right - sided Port - A - Cath is in adequate position .
    OUTPUT:
    
There is a pneumonia at the left lung base .