Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size remains mildly enlarged . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . Cavitary lesion within the left upper lobe measuring up to 21 mm is similar compared to the previous PET CT . Other previously seen nodules on the PET - CT are not as well visualized on the current exam . No focal consolidation , pleural effusion or pneumothorax is present . No acute osseous abnormalities are seen .
    OUTPUT:
    
Unchanged left upper lobe cavitary lesion corresponding to the known malignancy . Other previously demonstrated nodules within the lungs on the PET - CT are not as well visualized on the current radiograph .