Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the ___ radiograph , there is new opacity in the left mid zone , likely in the left upper zone anteriorly , with minimal stranding at the left base and with left greater than right pleural fluid and / or thickening posteriorly . There is also some pleural fluid and / or thickening along the lowermost left chest wall . Minimal atelectasis at the left lung base .- Elsewhere , the lungs are grossly clear , without focal consolidation or CHF . Heart size is at the upper limits of normal . The aorta is calcified . The cardiomediastinal contours are otherwise within normal limits . Mild - to - moderate degenerative changes of the thoracic spine are noted .
    OUTPUT:
    
1 ) Focal left upper lobe opacity , which is new compared with ___ . The differential certainly includes an acute pneumonic infiltrate . However , followup PA and lateral chest x-rays after resolution of acute symptoms is strongly recommended to exclude the possibility of an underlying chronic opacity . 2 ) Pleural fluid and / or thickening at left greater than right bases , may also be new .