What anatomical sites would you electively cover to intermediate dose for an oropharyngeal primary with clear extension into the nasopharynx?

For what is clearly a oropharyngeal primary, with clear extension up the soft palate and into the nasopharyngeal lateral wall, should the intermediate dose volume encompass similar volumes as those in a nasopharynx primary? In other words, should part of the clivus, inferior sphenoid, posterior maxillary/nasal cavity etc etc. all be covered?