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Schwannoma. (A) Contrast-enhanced CT axial image (arterial phase) shows a well-defined rounded soft-tissue lesion (arrow) in the right paravertebral mediastinum. This mass abuts the adjacent spinal nerve (arrowhead), appears hypointense on T1-weighted MR images (B) and moderately hyperintense with central hypointense foci on T2-weighted images (C), representing thickened fascicles (fascicular sign).
