paediatrics Brussels 17

Radiotherapy on primary site

• Volume defined by the post chemo / pre surgery volume • Diagnostic CT

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Easily available

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Short examination time ( small children)

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

• Preoperative surgical planning : CT contrast-enhanced images

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the solid portions of the mass are easier to define than on MRI

▪ the extent of calcification, which increases after treatment is more easily characterised.

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Better to delineate the vasculature

▪ particularly important when the mass is known to be encasing major vessels