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RT in PCNSL: Field design
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CTV
:
Whole brain including C1 and C2 and the posterior aspect of the eyes.
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The iso-center is set anteriorly and bisects the bony canthi (to reduce divergence
in possible future match to ocular field).
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Alternatively, anterior border of PTV is set with the isocenter 5 mm behind
the lens.
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If the eyes were originally involved, both eyes should be included in their
entirety in WBRT field.
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The role of tumour site boost is uncertain and is not recommended by most
experts
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It is not standard to irradiate the whole cranio-spinal axis