Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Near complete opacification of the left upper lung with known mass and lymphadenopathy . There is mild right ward shift of the cardiomediastinal silhouette , which is incompletely assessed due to obscuring mass . The right lung has low lung volume with mild basilar atelectasis . No pulmonary edema or pneumothorax .
    OUTPUT:
    
Near complete opacification of the left upper lung with known mass and lymphadenopathy . No pneumothorax . No superimposed acute process .