Figure 3.

(A) Sagittal view of CT sinus without contrast through frontal sinus outflow tract demonstrating the general reach of the nasoseptal flap (blue). The posterior wall of the frontal sinus and the lower third of the clivus are typically too distal for the conventional nasoseptal flap (red). (B) Coronal view demonstrating lateral reach covering the ethmoidal roof and medial bony orbit (blue) with distal limits at the lateral orbital wall (red). Image from Radiopaedia.org. Fr: Frontal sinus; Et: Ethmoid air cells; Sp: Sphenoid sinus; MT: middle turbinate; IT: inferior turbinate; MS: maxillary sinus; NS: nasal septum.