Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A frontal upright view of the chest was obtained portably . Opacification of the left hemithorax is likely a combination of pleural fluid and atelectasis , in a different distribution than on ___ . Opacity now partially obscuring the aortic arch is likely fluid between the lung and mediastinum . There is a possible small medial pneumothorax . Blunting of the right costophrenic sulcus is unchanged since at least ___ and may represent a small pleural effusion or pleural thickening . The right lung is clear . Evaluation of the cardiac silhouette is limited by the left opacity .
    OUTPUT:
    
1 . Possible small left medial pneumothorax . 2 . Overall decrease in left pleural effusion since ___ but increased medially loculated component .