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Surgically proven neurofibroma of the left sciatic nerve in a 33-year-old patient. Axial T2-weighted fat-saturated (a) and sagittal T1-weighted postcontrast (b) images show a lobulated enhancing mass (arrowheads) with isointense T1 (not shown) and high T2 signal originating from the left sciatic nerve. Proximally, the left S1 nerve root is thickened (white arrow). Note the target appearance of the neurofibroma.
