Hematological Malignancies

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