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C Eustachian tube cartilage, L Eustachian tube lumen, Line A connection between two most distant points of Eustachian tube lumen; Line A separates the Eustachian tube cartilage into the lateral lamina (LL) and the medial lamina (ML); LL/ML ratio: Area of lateral lamina divided by the area of the medial lamina. (Adapted from Matsune et al. [19])
