Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable frontal upright view of the chest was obtained . In comparison to the prior study , there is an ill - defined left hilar opacity which obscures the upper aspect of the left heart border , new . Cardiomediastinal contour is otherwise stable . Lungs are well expanded . There is no large effusion or pneumothorax . The upper abdomen and bones are grossly unremarkable .
    OUTPUT:
    
Increased ill - defined airspace opacification along the left hilus , partially obscuring the left heart border could represent post treatment changes , pneumonia or an area of parenchymal hemorrhage .