Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal radiograph of the chest demonstrates mild interval improvement in aeration of the left upper lobe which is predominated by a new left upper lobe mass resulting in bronchial obstruction and consolidation . Lung volumes have reduced since the prior radiograph , resulting in appearance of vascular congestion . Heart size is stable .
    OUTPUT:
    
Slight interval improvement in left upper lobe aeration with overall reduction in lung volumes .