Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph obtained . Lung volumes are quite low which significantly limits evaluation . There is left basal vague opacity which could reflect an early / mild pneumonia . There is right lung base atelectasis with elevated right hemidiaphragm . Heart size can not be reliably assessed . Mediastinal contour is also poorly assessed . Bony structures appear intact .
    OUTPUT:
    
Markedly limited exam , lung volumes and basal atelectasis . Pneumonia in the lower lungs can not be excluded .