An Idiopathic Azygos Vein Aneurysm Mimicking a Mediastinal Mass

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An Idiopathic Azygos Vein Aneurysm Mimicking a Mediastinal Mass Yoshinobu Ichiki, MD, PhD, Takayuki Hamatsu, MD, PhD, Taketoshi Suehiro, MD, PhD, Makiko Koike, MD, PhD, Fumihiro Tanaka, MD, PhD, Keizo Sugimachi, MD, PhD The Annals of Thoracic Surgery Volume 98, Issue 1, Pages 338-340 (July 2014) DOI: 10.1016/j.athoracsur.2013.09.024 Copyright © 2014 The Society of Thoracic Surgeons Terms and Conditions

Fig 1 (A) Chest roentgenogram revealed an abnormal shadow in the mediastinal field. (B) Chest computed tomography (CT) after intravenous contrast enhancement confirmed the presence of a slowly enhancing mass in the pathway of the azygos arch, which measured 3.5 cm. (C) Contrast-enhanced 3-dimensional CT revealed an enhanced posterior mediastinal mass, which was connected with the azygos arch. (D) T2-weighted magnetic resonance imaging (MRI) showed heterogeneous enhancement of the posterior mediastinal mass after the intravenous injection of gadolinium. The Annals of Thoracic Surgery 2014 98, 338-340DOI: (10.1016/j.athoracsur.2013.09.024) Copyright © 2014 The Society of Thoracic Surgeons Terms and Conditions

Fig 2 An aneurysmal dilatation of the azygos vein was confirmed intraoperatively. The Annals of Thoracic Surgery 2014 98, 338-340DOI: (10.1016/j.athoracsur.2013.09.024) Copyright © 2014 The Society of Thoracic Surgeons Terms and Conditions

Fig 3 The histopathologic findings of a hematoxylin and eosin–stained section showed a cystically dilated and blood-filled venous structure with a muscle coat of variable thickness (×40). The Annals of Thoracic Surgery 2014 98, 338-340DOI: (10.1016/j.athoracsur.2013.09.024) Copyright © 2014 The Society of Thoracic Surgeons Terms and Conditions