Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright AP and lateral views of the chest were obtained . Heart size is top normal but unchanged . Large hiatal hernia is re - demonstrated . Aortic knob calcifications are again seen . Mediastinal and hilar contours are stable . Mild bibasilar atelectasis is noted . Blunting of the left costophrenic angle could suggest a trace left pleural effusion . No pulmonary vascular congestion is noted . There is no pneumothorax . Compression deformity of a lower thoracic vertebral body is age indeterminate . A VP shunt catheter is seen coursing along the right neck and anterior right chest wall .
    OUTPUT:
    
Mild bibasilar atelectasis and possible small left pleural effusion . Age indeterminate compression deformity of a lower thoracic vertebral body .