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eustachian tube orifice. According to the AJCC, the posterior margins of the choanal orifices and of the nasal septum are included in the nasal fossa (which has no AJCC chapter), and are excluded from the nasopharynx staging system. However, all subsites listed above (except nasal fossa) are included in the nasopharynx Summary Stage chapter.

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  Tubes, Eustachian, Eustachian tube

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