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Enhanced computed tomography scans of the 6.1x5.0 cm mass prior to surgery, with the abnormality marked by white arrows. (A) Venous and (B) arterial phase.
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Enhanced CT was uneven and the superior vena cava appeared flattened due to the pressure on the right vagus nerve (Fig. 1).
Mass observed using video-assisted thoracic surgery.
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The tumor measured ~6.5x6.1x5.0 cm in size (Fig. 2).
Histological analysis of the resected mass. (A) Spindle cells arranged in fasicles in loose stroma (hematoxylin and eosin staining; magnification, x200). (B) Strong immunohistochemical staining for S-100 protein (brown) in the tumor cells (magnification, x200).
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Subsequent pathological examination determined the distribution of spindle cells in fascicles in loose stroma (hematoxylin and eosin staining; magnification, x200) and strong staining of S-100 protein, clarifying the diagnosis of a schwannoma (Fig. 3).
Computed tomography showing no abnormalities on follow-up.
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Furthermore, post-operative chest CT identified no marked abnormalities of the mediastinum (Fig. 4).