Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable frontal chest radiographs shows increased opacity over the left lung base . This may be partially due to overlying soft tissue ; however , it may be consolidation for an underlying infection or aspiration . The lung volumes are low . No pleural effusion or pneumothorax is identified . The heart size is normal . The mediastinal contours are unremarkable . There are chronic degenerative changes in the left shoulder .
    OUTPUT:
    
Left lung opacity raises the possibility of underlying infection or aspiration . If the patient is able , PA and lateral views would be helpful for further evaluation .