<prompt> Which is not visualized on posterior rhinoscopy:Eustachian tubeInferior meatusMiddle meatusSuperior concha  <response>: Posterior rhinoscopy: It is method of examination of the posterior aspect of nose and pharynx. Structures seen on posterior rhinoscopy: - Both choanae - Posterior end of nasal septum - Opening of Eustachian - Posterior end of superiortube middle and inferior turbinates - Fossa of Rosenmuller - Torus Tubarius - Adenoids - Roof and posterior wall and nasopharynx. 