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Figure 4: Anatomical structures of the midline anterior skull base (Superior view). The roof of the frontal sinus, the ethmoid sinus and the sphenoid sinus was mostly removed. This figure showed the infundibulum of the frontal sinus, the ethmoidal cells and the roof mucosa of the sphenoidal sinus. The four horizontal arrows represent the maximum opening window width of the anterior skull base at the level of the central crista galli, the anterior ethmoidal canal, the posterior ethmoidal canal and the optic canal cranial opening, respectively. Note that the right prominence of the optic canal bulges into the Onodi cell. Frontal sinus (FS), anterior ethmoid sinus (AE), posterior ethmoid sinus (PE)

Figure 4: Anatomical structures of the midline anterior skull base (Superior view). The roof of the frontal sinus, the ethmoid sinus and the sphenoid sinus was mostly removed. This figure showed the infundibulum of the frontal sinus, the ethmoidal cells and the roof mucosa of the sphenoidal sinus. The four horizontal arrows represent the maximum opening window width of the anterior skull base at the level of the central crista galli, the anterior ethmoidal canal, the posterior ethmoidal canal and the optic canal cranial opening, respectively. Note that the right prominence of the optic canal bulges into the Onodi cell. Frontal sinus (FS), anterior ethmoid sinus (AE), posterior ethmoid sinus (PE)