Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest demonstrates a slightly oblique patient and a limited study due to body habitus . The cardiac contour is prominent . There is dense atelectasis in the left base , accentuated by prominent pericardial ___ , ___ standing and less likely infection . The left upper lung remains clear . The right lung demonstrates mildly hazy appearance , similar as compared to ___ .
    OUTPUT:
    
Dense atelectasis of the left lung base , less likely pneumonia .