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1. Figure 1. Diagram of a coronal section through the cavernous sinuses and the sella turcica. Note that the medial wall of the cavernous sinus (CS) is constituted by only a single layer of the dura mater. ACA = anterior cerebral artery, ICA = cavernous segment of the ICA, III = oculomotor nerve, IV = trochlear nerve, MCA = middle cerebral artery, OC = optic chiasm, PIT = pituitary gland, SS = sphenoid sinus, VI = abducens nerve, V1 = ophthalmic nerve, V2 = maxillary nerve, black arrowhead = inner periosteal layer of the dura, white arrowhead = outer meningeal layer of the dura, * = subarachnoid space. Mahalingam HV. Published Online: April 12, 2019 https://doi.org/10.1148/rg.2019180122