Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are slightly low . The lungs are clear . The heart is top normal in size . There are no pleural effusions . No pneumothorax is seen . The esophagus is air-filled and dilated at the level of the thoracic inlet . There is a spinal stimulator device projecting along the posterior aspect of the thoracic spine . Cholecystectomy clips are noted .
    OUTPUT:
    
No radiographic evidence of an acute cardiac or pulmonary process , although this examination neither suggests nor excludes the diagnosis of pulmonary embolism .