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AP radiograph demonstrating CTV elective nodal volume contours. In blue is the ipsilateral neck. Green represents the contralateral low neck, below level where the postierior belly of the digastric muscle crosses the internal jugular vein. Yellow indicates the contralateral high level II and red the contralateral retropharyngeal lymph nodes. (A) Generation 1. (B) Generation 2. (C) Generation 3.
