Selective loss of vergence control secondary to bilateral paramedian thalamic infarction.
The supranuclear pathways for vergence eye movements are poorly understood. The authors report a 57-year-old patient who presented with selective loss of vergence control and dissociation of light and near reaction. MRI showed a symmetric paramedian thalamic infarction without midbrain lesion. The findings suggest that this syndrome is due to an interruption of supranuclear fibers to midbrain vergence neurons.
Wiest
G
G
Department of Neurology, University of Vienna, Austria. lmorgens@neuro.med.uth.tmc.edu
Mallek
R
R
Baumgartner
C
C
D002544:Cerebral Infarction / Q000175:diagnosis* / Q000503:physiopathology; D003290:Convergence, Ocular / Q000502:physiology*; D004292:Dominance, Cerebral / Q000502:physiology*; D005133:Eye Movements / Q000502:physiology; D006801:Humans; D008297:Male; D008636:Mesencephalon / Q000503:physiopathology; D008875:Middle Aged; D009412:Nerve Fibers / Q000502:physiology; D009415:Nerve Net / Q000503:physiopathology; D009434:Neural Pathways / Q000502:physiology; D009801:Oculomotor Muscles / Q000294:innervation; D013786:Thalamic Diseases / Q000175:diagnosis* / Q000503:physiopathology; D013787:Thalamic Nuclei / Q000503:physiopathology*