Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable semi upright view of the chest . Lung volumes are low limiting assessment . The previously noted right upper extremity PICC line has been removed . There is a left - sided pleural effusion which is at least moderate in size with associated left basal compressive atelectasis . Aside from right basal atelectasis , the right lung appears clear . The heart size can not be assessed . Mediastinal contour is prominent though unchanged . Bony structures appear intact .
    OUTPUT:
    
Moderate left pleural effusion with associated compressive lower lobe atelectasis . Low lung volumes limits assessment .