CTICasesAzygos Lobe with Empty Azygos Fissure
Imaging findings
Chest radiograph and CT show a classic right-sided azygos lobe and fissure, but the azygos vein is absent from the expected position at the base of the fissure, instead located in a normal paratracheal position.
Key takeaways
An 'empty' azygos fissure is a rare variant. It typically occurs when a patient with an azygos lobe experiences a significant lung collapse or surgical intervention, causing the azygos vein to slip out of its pleural groove and relocate into a normal paratracheal position.
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