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1 Introduction The Eustachian tube (ET) is a critical anatomical structure connecting the nasopharynx and the tympanic cavity of the middle ear, composed of a mucosa-lined lumen, cartilaginous and bony portions, surrounding soft tissues, and peritubal musculature [1]. Under normal physiological conditions, it remains predominantly closed, opening transiently only during swallowing, yawning, or sneezing, by contraction of the tensor veli palatini muscle [2, 3].
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