Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Lung volumes are very low with bibasal atelectasis . Basal atelectasis without definite focal pneumonia , a large effusion or pneumothorax . Heart size difficult to assess . Mediastinal contour is grossly unremarkable . Bony structures are intact . Right humeral head prosthesis noted .
    OUTPUT:
    
Limited , basal atelectasis .