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Typical treatment plan for a patient with a skull base chondrosarcoma treated up to a total dose of 70.2 Gy-RBE with combined photon–proton therapy (34.2 Gy photons, 36 Gy-RBE protons). ant, anterior; CTV, clinical target volume; IAC, internal auditory canals; L, left; post, posterior; LOBETEMP, temporal lobe; PTV, planning target volume; R, right.
