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Large well-defined right infratemporal soft tissue mass is T1 isointense, avidly enhancing with central areas of non-enhancement. Its medial extent is to just below the foramen ovale without intracranial extension. Laterally it extends into temporalis, abutting the base of skull which it remodels. No intracranial extension.
Conclusion: Mass most likely to represent a nerve sheath tumour. Given it's location and ascent into temporalis it is likely arising from deep temporal branches of the mandibular division of the trigeminal nerve.