case_images: PMC3955859_01
case_images: PA CXR showing a right sided round soft tissue mass lesion probably in the right posterior mediastinum
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case_images: PMC3955859_01_iranjradiol-11-7467-g001.jpg
case_images: fig7599
case_images: A PA chest X-ray showed a right sided large spherical shadow with clear-cut margins probably in the posterior mediastinum (Figure 1). 
case_images: Axial CT scan at the level of the carina shows a lobulated enhancing soft tissue lesion in the right posterior mediastinum
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case_images: PMC3955859_01_iranjradiol-11-7467-g002.jpg
case_images: fig7600
case_images: The mass was located in the position of the azygos vein (Figure 2). 
case_images: MRI of the thoracic region showing signal void tubular structure in the right paravertebral space
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case_images: fig7601
case_images: MRI study (Figure 3). Magnetic resonance angiography (MRA) showed an enhancing saccular right paravertebral vascular lesion draining to the azygos vein through a wide neck in the thoracic region.
case_images: Contrast enhanced MRA study of the thoracic aorta demonstrating a saccular enhancing vascular lesion with a wide neck connecting to the azygos vein on the right side
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case_images: PMC3955859_01_iranjradiol-11-7467-g004.jpg
case_images: fig7602
case_images: With regards to the abovementioned findings, the impression was aneurysmal dilatation of the azygos vein (Figure 4). 
case_images: CT angiography after 3 months. No growth or thrombosis was detected.
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case_images: PMC3955859_01_iranjradiol-11-7467-g005.jpg
case_images: fig7603
case_images: In CT angiography after 3 months, no growth or thrombosis was detected (Figure 5).