1. Idiopathic Saccular Azygos Vein Aneurysm
Atsushi Watanabe, Katsuyuki Kusajima, Naohiko Aisaka, Hiroyuki Sugawara, Kazunori Tsunematsu 
The Annals of Thoracic Surgery 
Volume 65, Issue 5, Pages (May 1998)
DOI: /S (98)

2. Fig. 1
Dynamic computed tomogram in the spine position showing aneurysm of the azygos vein, 30 mm in diameter, connected to the azygos arch. The back side of the aneurysm is greatly enhanced.
The Annals of Thoracic Surgery  , DOI: ( /S (98) )

3. Fig. 2
Magnetic resonance image showing that the mass and azygos vein are contiguous just above the arch and the mass has hyperintense and hypointense areas on a T2-weighted image.
The Annals of Thoracic Surgery  , DOI: ( /S (98) )

4. Fig. 3
Intraoperative view showing an azygos vein aneurysm originating from the azygos arch. (Arrowhead = azygos arch; open arrow = superior vena cava; white arrow = aneurysm.)
The Annals of Thoracic Surgery  , DOI: ( /S (98) )