Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There is a moderate left pleural effusion likely with compressive left lower lobe atelectasis node difficult to exclude underlying pneumonia or other pathology . Right lung is clear . Heart size can not be assessed . Mediastinal contour is normal . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Moderate left pleural effusion with underlying atelectasis , difficult to exclude pneumonia or other acute process .