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Figure 42 Sagittal (a) and endoscopic (b) views after removal of the lamina papyracea from the anterior ethmoid area. P = posterior ethmoid artery. A = anterior ethmoid artery. F = frontal sinus ostium. The transition area from the ethmoid roof to the posterior wall of the frontal sinus is seen just anterosuperior to the anterior ethmoid artery (small arrows). Inadvertent intracranial penetration through this wall results in CSF rhinorrhea.

Figure 42 Sagittal (a) and endoscopic (b) views after removal of the lamina papyracea from the anterior ethmoid area. P = posterior ethmoid artery. A = anterior ethmoid artery. F = frontal sinus ostium. The transition area from the ethmoid roof to the posterior wall of the frontal sinus is seen just anterosuperior to the anterior ethmoid artery (small arrows). Inadvertent intracranial penetration through this wall results in CSF rhinorrhea.

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