PMC3099200_01
The posteroanterior chest radiograph shows a well-defined radiopaque lesion.
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Initial posteroanterior chest radiograph revealed the presence of a left-sided soft tissue mass located at the level of the aortic arch (Figure 1).
The sagittal T1-w (a) MR image shows a hypointense lobulated lesion. The mass demonstrates heterogeneous but predominantly high signal intensity in the sagittal T2-w. (b) MR image. Note the superficial palpable component of the tumor. (c) The T2 axial view shows how the tumor is positioned next to the ventral structures and its relationship to the spinal cord.
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MRI (Figure 2). Mineralised areas that were depicted in the CT examination demonstrated low signal intensity in all pulse sequences.
The postoperative plain X-ray.
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Fusion was then accomplished by decorticating the transverse processes and an autograft with bone chips was applied after the exposed dura had been protected (Figure 3). 
The second stage of the procedure. The tumour had 3 lobes and was treated with liquid nitrogen (-17 C for 15 min/lobe). The equipment used was Candela CS5 (Spembly Medical).
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We used 3.5 and 10 mm rod-shaped and a plate probe (for small superficial tumors) with liquid N2 (55 psi) which can reach -196 C (tissue temperature is usually 30 degrees higher (Figure 4).
Postoperative MRI (a, b, c) and CT scan (d, e) show no evidence of recurrence six months after the operation.
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Postoperative MRI and CT scan 6 months following the operation confirm the en bloc resection of the tumour (Figure 5).