Ventral Pontine Syndrome (Raymond Syndrome)


Eponym

Raymond Syndrome

Anatomy

Pons: Ventral medial pons

Vascular

Basilar artery: Paramedian branches

Signs & Symptoms

Side Manifestation Comments
Ipsilateral Lateral gaze weakness CN VI
Contralateral Weakness – upper and lower extremity Pyramidal tract

Notes

Raymond Syndrome (Alternating abducens hemiplegia) A unilateral lesion of the ventral medial pons, which affects the ipsilateral abducens nerve fascicles and the corticospinal tract but spares cranial nerve VII.

  1. Ipsiplateral lateral rectus paresis, due to cranial nerve VI involvement
  2. Contralateral hemipegia, sparing the face, due to pyramidal tract involvement

References

J Neurol Neurosurg Psych 58:261, 1995.