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Radiotherapy on primary site
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Volume defined by the post chemo / pre surgery
volume
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Diagnostic CT
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Easily available
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Short examination time ( small children)
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Diagnostic MRI is superior to CT if
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pelvic tumors
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metastatic marrow disease,
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chest wall invasion and
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spinal canal involvement
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long examination in small kids
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Preoperative surgical planning : CT contrast-enhanced images
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the solid portions of the mass are easier to define than on MRI
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the extent of calcification, which increases after treatment is more easily characterised.
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Better to delineate the vasculature
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particularly important when the mass is known to be encasing major vessels