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The picture illustrates the two different angles of attack for anterior and middle cranial fossa access. The red dotted line, orthogonal to the fronto-zygomatic suture, represents an imaginary limit between the lateral orbital wall and the orbital roof. FR: foramen rotundum; IOF: inferior orbital fissure; LSW: lesser sphenoid wing; OC: optic canal; SOF: superior orbital fissure.
