Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright frontal and lateral views of the chest were obtained . There are relatively low lung volumes , which accentuate the bronchovascular markings , particularly at the lung bases . Mild left base atelectasis . No focal consolidation , large pleural effusion or pneumothorax is seen . The costal and apical margins again appear slightly thickened , which may be due to fat deposition . No evidence of free air beneath the diaphragms .
    OUTPUT:
    
Low lung volumes , but otherwise no acute cardiopulmonary process . No evidence of free air beneath the diaphragms .