Delayed traumatic midbrain syrinx. Clinical, pathologic, and electrophysiologic features
D. C. Anderson, S. Bundlie, D. A. Larson, G. Rockswold and A. Mastri
Department of Neurology, Hennepin County Medical Center, Minneapolis, MN 55415.
Seven months following severe crushing closed-head trauma with initial
excellent recovery, neurologic deficits referable to the right
mesencephalon abruptly developed in a 28-year-old man. Computed tomography
demonstrated a cystic midbrain lesion with apparent communication with the
aqueduct (later confirmed at autopsy). Brain-stem auditory evoked
potentials after the clinical deterioration showed depression of amplitude
of wave V, compared with predeficit records, only when the ear
contralateral to the brain-stem lesion was stimulated.
