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Rectum Pre-Op Radiotherapy Planning
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GTV:
clinical exam, sigmoidoscopy, MRI
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CTV:
entire mesorectum from L5/S1 to 2-3cm
below GTV
Consider external iliac LN if tumour invades other organs
Consider inguinal LN if tumour very low (ano-rectal)
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PTV: CTV + 8-10mm (institutional)