Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Two views of the chest demonstrate a normal cardiomediastinal silhouette . In the left upper lobe is again seen a 4 .4 x 4 .8 cm mass with a more lucent center and surrounding atelectasis and / or fibrosis , consistent with known lung cancer , post treatment . No other focal consolidation or lesion is seen . There is no pleural effusion or large pneumothorax . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process . Redemonstration of a left upper lobe mass .