Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest are obtained . Minimal blunting of the left costophrenic angle could be due to pleural thickening or trace pleural effusion . There are relatively low lung volumes . Given this , no definite focal consolidation is seen . There is no evidence of pneumothorax . The aorta is calcified and tortuous . The cardiac silhouette is not enlarged . No overt pulmonary edema is seen . Degenerative changes are seen along the spine . There are also degenerative changes at bilateral acromioclavicular and shoulder joints .
    OUTPUT:
    
Mild blunting of the left costophrenic angle could be due to a trace pleural effusion versus pleural thickening .