Clinical, neuroimage and neurophysiological signs of brainstem involvement in all study patients.

Abbreviations: TBR = trigeminal blink reflex; SBR = somatosensory blink reflex; R = right; L = left; B = bilateral refer to the side of the involvement. aPatient's identification number (in alphabetical order). bPatients included in the AbLat group (see text for description of each TBR pattern).