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CT scan is usually done to confirm the presence of
lesion, and it also helps to define the location and extent
of lesion, adjacent organ involvement, or vascular
involvement. CT demonstrates calcification in up to 90%.
The lesion characterization has become better with the
advent of multiplanar image reconstructions in MDCT.
However, MR imaging is the investigation of choice for
better characterization and demonstration of full extent of
mass, extradural intraspinal extension and chest wall
invasion. The advantages of MR over CT are its direct
multiplanar imaging and better contrast resolution,
which can allow differentiation of vascular from non
vascular lesions without the aid of intravenous contrast
agent. MR is very often used to evaluate posterior
mediastinal tumor involving spine and spinal canal.

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