Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest demonstrates low lung volumes , accentuating peribronchovascular markings . However , there is no evidence of pneumothorax , pulmonary edema , or confluent consolidation . Blunting of the left costophrenic angle may suggest a small pleural effusion . There is no free air under the diaphragm . The heart is borderline in size . The mediastinal and hilar contours are within normal limits .
    OUTPUT:
    
Low lung volumes with possible small left pleural effusion without definite acute abnormality .