Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright view of the chest demonstrates low lung volumes . There are diffuse bilateral airspace opacities , which have progressed since prior . Small focal consolidations are seen in the right lung base abutting the right cardiac border . No pleural effusion is seen . There is no pneumothorax . Hilar and mediastinal silhouettes are unchanged . Heart size is mildly enlarged . Partially imaged upper abdomen is unremarkable .
    OUTPUT:
    
Diffuse bilateral airspace opacities , have progressed since ___ exam . The above findings most likely represent multifocal infection . Pulmonary edema and ARDS are less likely differential considerations .