Nerve Sheath Tumors

            Schwannomas in the parasellar region arise from the trigeminal nerve and rarely from the 3rd, 4th, and 6th cranial nerves. The cisternal, cavernous, or extracranial components of the nerves can be involved. They are well-encapsulated, benign tumors, and their more or less globular shape distinguishes them from the broad-based meningiomas. Schwannomas are isointense on T1 and mildly hyperintense on T2-weighted images. Cystic components may be present, and occasional hemorrhage and calcification can further contribute to a heterogeneous appearance. The solid portions of theses tumors enhance brightly with intravenous contrast. Endnote  

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