Presentation
Known sigmoid colon cancer, undergoing staging.
Patient Data
Age: 30 years
Gender: Male
From the case:
Azygos lobe and fissure
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Azygos lobe is incidentally noted (normal variant). Otherwise, the chest x-ray is unremarkable, with no suspicious lesion.
Case Discussion
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.
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