Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs were obtained . Lung volumes are extremely low with resulting bronchovascular crowding . The heart is mildly enlarged without pulmonary edema . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Low lung volumes . Mild cardiomegaly without pulmonary edema .