Enlarged azygos vein

An enlarged/dilated azygos vein may result from a number of physiological as well as pathological causes. The enlarged azygos vein may be seen as a widened right paratracheal/paraspinal stripe on a frontal chest radiograph.

Spelling it "azygous" when referring to the vein is incorrect, regardless of whether British or American English 5. Azygous is a word in English meaning 'without pair', but in the context of anatomy, see Terminologia Anatomica, azygos vein is the sole correct spelling.

There are a number of physiological causes for enlargement of the azygos vein such as pregnancy and over hydration, but most cases are pathological:

The differential diagnosis depends on the radiographic study being reviewed; on a CXR, the differential includes:

Article information

rID: 9093
System: Cardiac, Vascular
Section: Gamuts
Synonyms or Alternate Spellings:
  • Enlarged azygous vein : Differential diagnosis
  • Enlarged azygous vein
  • Differential diagnosis for an enlarged azygous vein
  • Dilated azygos vein
  • Dilated azygous vein
  • Azygos dilatation
  • Azygous dilatation
  • Azygos enlargement
  • Azygous enlargement

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Cases and figures

  • Case 1: from azygous continuation of IVC
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  • Case 2: from SVC obstruction
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  • Case 3: in azygos fissure from IVC continuation
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  • Case 4: enlarged azygos vein from portal hypertension
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  • Case 5: azygos vein aneurysm
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