Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal silhouette is stable . Inreased intersitial marking throughout the lungs are unchanged compared to priors . There is persistent left base opacity . There is no evidence of a pneumothorax . The visualized osseous structures are unchanged with chronic posterior right rib fractures , right clavicular fracture and anterior cervicothoracic spine fixation hardware .
    OUTPUT:
    
Persistent opacification at the left lung base may be secondary to aspiration / infection .