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Comparison between initial and follow-up axial T1 Post-gadolinium MR imaging in patient 1 a MRI shows asymmetric enhancement of the mastoid segment of the left CN VII (arrow) b Follow-up MRI 12 months later shows asymmetric enhancement in the left masticator space extending medially along the expected course of the auriculotemporal nerve (double arrow), a branch of the left trigeminal nerve
