Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable single frontal chest radiograph was obtained . Lung volumes are low , which leads to bronchovascular crowding and accentuation of the cardiac silhouette . No focal opacity is identified . There is blunting of the left lateral costophrenic angle , possibly due to a small pleural effusion . There is no pneumothorax . The right humerus is partially visualized but there is likely a chronic deformity of the humeral neck .
    OUTPUT:
    
1 . No focal opacity . Small left - sided pleural effusion . 2 . Possible chronic deformity of the right humerus though incompletely visualized . Correlate with prior history of trauma .