Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient with known left lower lobe mass , as better seen on recent prior CT . Mild right base atelectasis is seen without definite focal consolidation . No large pleural effusion . No evidence of pneumothorax . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Known left lower lobe pulmonary mass , better assessed on recent prior CT . No definite new focal consolidation seen .