• Surg Radiol Anat · Aug 2009

    Case Reports

    Azygos lobe without azygos vein as a sign of previous iatrogenic pneumothorax: two case reports.

    • Thomas Betschart and Gerhard W Goerres.
    • Institut für Diagnostische und Interventionelle Radiologie sowie Nuklearmedizin, Tièchestrasse 99, Zurich, Switzerland.
    • Surg Radiol Anat. 2009 Aug 1;31(7):559-62.

    BackgroundA spontaneous pneumothorax appears to be rarely seen in patients with an azygos lobe, although this normal variant is incidentally found on CT and chest X-ray. The displacement of the azygos vein from the azygos lobe to the paramediastinal position indicates previous pneumothorax.MethodsWe report two patients (a 59 and a 27-year-old female) where the finding of an azygos lobe without an azygos vein proved to be a sign of previous iatrogenic pneumothorax.ConclusionsDocumentation of an azygos lobe without azygos vein is highly suggestive of a previous pneumothorax. This observation may indicate an iatrogenic cause, because of the possible protective effect of an azygos lobe to the occurrence of spontaneous pneumothorax.

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