Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable upright chest radiograph demonstrate low lung volumes . A left chest porta catheter terminates within the anticipated location of the right atrium . Heart size is upper limits of normal in size . There is no evidence of pulmonary edema , pleural effusion , or pneumothorax .
    OUTPUT:
    
Low lung volumes without acute intrathoracic abnormality .