Tubal tonsil
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The Tubal Tonsil is one of the four main tonsil groups which include the Palatine tonsil, the Lingual tonsil, the Pharyngeal tonsil, and the Tubal Tonsil. Its location is posterior the openings of the pharyngotympanic tubes into the pharynx.(Human Anatomy 4th edition, Marieb, Mallatt, Wilhelm pg. 572)