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Fig. 1A —41-year-old man with leg weakness, decreased dexterity in hands, and numbness in umbilical and perineal regions. Axial T1-weighted gadolinium-enhanced MR image through internal auditory canals shows enhancement of enlarged bilateral cranial nerves VII and VIII (large arrows) within internal auditory canals. Geniculate ganglia and horizontal portions of cranial nerve VII (small arrows) are also enlarged. There is marked hypertrophy of cranial nerve V (arrowheads) in region of Meckel's cave and extending out through foramen rotundum (V2).