Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright frontal view of the chest shows no free air under the diaphragm . No pleural effusion , pneumothorax or focal airspace consolidation . There is a vague opacity abutting the left heart border , which is new from prior . The heart is normal in size . The mediastinum and hilus are unremarkable .
    OUTPUT:
    
1 . No free air . 2 . Vague opacity at the left lung base obscuring the left heart , of unclear clinical significance .