Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 00 : 23 is submitted .
    OUTPUT:
    
The patient 's face mask and mandible obscures the apices . No large pneumothorax is appreciated . Lung volumes are diminished and there are bilateral streaky opacities which may reflect areas of atelectasis . The central pulmonary vessels remain prominent which may reflect underlying pulmonary arterial hypertension . Overall cardiac and mediastinal contours are likely stable given differences in positioning .