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Anatomy of the nasal turbinates and meatuses. (a) Nasal polyposis obstructing the left nasal cavity. On the right side, inferior, middle and inferior turbinates are visible; inferior meatus is partially occupied by hypertrophic inferior meatus. (b) White dashed line: middle meatus; grey dashed line: inferior meatus; asterisk: middle turbinate; double asterisks: inferior turbinate.
