I have read the interesting article by Katsuno et al1 reporting a case of trigeminal neuralgia (TN) secondary to brain stem infarction, and have a few comments. The authors report the case of a 68-year-old man who presented with sharp pain on the right side of his face and in whom magnetic resonance imaging showed a wedge-shaped lesion without mass effect adjacent to the root entry zone of the right trigeminal nerve. The authors' discussion of the physiopathology of the entity postulates that the infarction of the principal sensory trigeminal nucleus is the cause of the pain.
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