Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: 3 mm right upper lobe lung nodule , level of the ___ anterior interspace is confirmed . It was not present ___ years ago on ___ . Lungs are otherwise clear . There is no pleural abnormality or evidence of central lymph node enlargement . Heart size is normal .
    OUTPUT:
    
Suggest followup conventional problem lateral chest radiographs in 6 months to follow this sub 4 mm right upper lobe nodule , of indeterminate chronicity .