Azygos lobe and fissure
Known sigmoid cancer, undergoing staging.
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Azygos lobe is incidentally noted (normal variant). Otherwise, the chest x-ray is unremarkable, with no suspicious lesion.
This is a normal anatomic variant of the right upper lobe due to invagination of the azygos vein and pleura during fetal development. It is not a true accessory lobe as it does not have its own bronchus.