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Use MRI to identify extent of bony and soft tissue disease
GTV takes into account pre-chemo extent of disease
CTV 1.0-1.5cm margin, plus PTV margin
•
Except for large soft tissue mass extending into a body cavity
which responds to CTX and allows normal tissues to shift
back into position
Post-op RT
•
Not as well defined
•
Pre-op tumor bed with margins, c/d to any residual
Current RT Volume Recommendations
Appropriate modifications in tumors expanding into anatomical cavities
(thorax, pelvis) without infiltration