Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Previously noted feeding tube is been removed . There is persistent large left pleural effusion with associated compressive atelectasis in the left lung . Mild increase in interstitial markings could reflect a component of interstitial edema . Difficult to exclude a pneumonia in the left base in the correct clinical setting . The heart is difficult to assess . Mediastinal contour appears grossly unchanged . Bony structures are intact . A compression deformity involving the thoracolumbar junction appears unchanged .
    OUTPUT:
    
Persistent large left effusion with compressive atelectasis in the lower lung difficult to exclude a superimposed pneumonia . Increased interstitial opacities concerning for interstitial edema .