Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable frontal chest radiograph demonstrates increasing air space opacity in a right infrahilar location , which is compatible with given history of aspiration although superimposed pneumonia can not be excluded . There is no significant pleural effusion or pneumothorax . The cardiac silhouette and mediastinal contours are normal . The pulmonary vasculature is normal . There has been interval extubation and NG tube removal .
    OUTPUT:
    
Increasing right infrahilar air space opacity which is compatible with given history of aspiration , although pneumonia can not be excluded . The interval increase in the extent of the opacity weights the differential diagnosis towards pneumonia rather than atelectasis .