The planning CT (and MRI if performed) should be carefully evaluated to detect macroscopic residual disease or lymphadenopathy. Radiotherapy is usually indicated adjuvantly for patients with high risk features. No GTV is defined unless there is macroscopic residual disease. The CTV60 is contoured as the sites of possible microscopic disease. Particular attention is given to the deep excision margin which is likely to be close or involved if the facial nerve has been preserved. As a minimum, the medial extent of the CTV60 should be to the lateral surface of the internal jugular vein, but if the deep lobe of the parotid is thought to contain tumour, the parapharyngeal space should be included. The lateral extent of the CTV60 will be close to the surface of the skin. The position of the contralateral parotid on the planning CT can be a useful for guiding to the superior and inferior limits of the CTV60 (figure-5). The irregularity of PTV is treated better with conformal radiotherapy than conventional radiotherapy, but to reduce dose to organs at risk, an ipsilateral anterior and posterior oblique wedged beam arrangement can be planned conventionally. Care should be taken to avoid organs at risk, especially exit dose to the contralateral eye (figure-5).