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Figure 4: (a) Transposition of V2 outside the maxillary canal to allow drilling safely the Pb and MS. (b) Dissection of periorbita from GWS. The MOB (arrowhead) is early encountered laterally. (c) The MOB (arrowhead) was more evident with more posterior and medial dissection of periorbita from GWS. The MOB appeared as a whitish band with a distinct plane from periorbita, and medial compartment of SOF and dura propria. The GWS was drilled to expose MCF dura. (d) the MCF dura after the removal of GWS. The MOB (arrowhead) was separated from the medial compartment of SOF (arrow) and dura propria. Note the medial compartment of SOF is continuous posteriorly with the cavernous sinus. V1 was obscured by fat in AMT. MOB: meningoorbital band, Pb: pterygoid base, MS: maxillary strut, GWS: greater wing of sphenoid, mSOF: medial compartment of SOF, cav: cavernous sinus, MCFd: middle cranial fossa dura, AMT: anteromedial triangle, ION: infraorbital nerve, V1: ophthalmic nerve, V2: maxillary nerve

Figure 4: (a) Transposition of V2 outside the maxillary canal to allow drilling safely the Pb and MS. (b) Dissection of periorbita from GWS. The MOB (arrowhead) is early encountered laterally. (c) The MOB (arrowhead) was more evident with more posterior and medial dissection of periorbita from GWS. The MOB appeared as a whitish band with a distinct plane from periorbita, and medial compartment of SOF and dura propria. The GWS was drilled to expose MCF dura. (d) the MCF dura after the removal of GWS. The MOB (arrowhead) was separated from the medial compartment of SOF (arrow) and dura propria. Note the medial compartment of SOF is continuous posteriorly with the cavernous sinus. V1 was obscured by fat in AMT. MOB: meningoorbital band, Pb: pterygoid base, MS: maxillary strut, GWS: greater wing of sphenoid, mSOF: medial compartment of SOF, cav: cavernous sinus, MCFd: middle cranial fossa dura, AMT: anteromedial triangle, ION: infraorbital nerve, V1: ophthalmic nerve, V2: maxillary nerve