Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The lateral view is suboptimal due to the patient 's overlying arm . On the frontal view , there appears to be slight increase in opacity at the left lung base , difficult to evaluate on the lateral view due to the patient 's overlapping arm .
    OUTPUT:
    
1 . Slight increased opacity at the left lung base may be artifactual ; however , underlying consolidation is not excluded . Lateral view with the patient 's arm not overlapping would be helpful for further evaluation . 2 . No definite pneumothorax seen ; please note that the questionable sliver of pneumothorax seen on CT cervical spine would be difficult to appreciate on radiography .