FINDINGS Figure 92-1. Coronal post-contrast T1WI shows an enhancing small mass (arrow) in the expected course of the left oculomotor nerve in the superolateral left cavernous sinus. Figure 92-2. Axial post-contrast T1WI shows the anterior location of the mass (arrow) within the left cavernous sinus. Figure 92-3. Coronal T2WI through the cavernous sinuses in a companion case. There is a well-defined round hypointense mass (arrow) in the mid-left cavernous sinus.
DIFFERENTIAL DIAGNOSIS Meningioma, metastasis (including perineural spread), lymphoma, schwannoma, inflammatory pseudotumor.
DIAGNOSIS Cavernous sinus schwannoma (oculomotor nerve).
DISCUSSION
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