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Behind the ostium of the eustachian tube is a deep recess, the pharyngeal recess.
At the base of this recess is the retropharyngeal lymph node. This is clinically significant in that it may be involved in certain head and neck cancers, notably nasopharyngeal cancer.
This article incorporates text in the public domain from page 1141 of the 20th edition of Gray's Anatomy
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