Neurosurgery notes/Vascular/AV shunt/Arteriovenous malformations (AVM)/Tentorial Cerebellar AVM

Tentorial Cerebellar AVM

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Cerebellar AVM

General

  • Midline AVMs based in the superior vermis differ from tentorial AVMs and are categorized instead as vermian AVMs.

Numbers

  • 20% of all cerebellar AVMs

Location

  • On the tentorial surface
  • In the quadrangular, simple, and superior semilunar lobules.
The tentorial cerebellar AVM: (a) lateral and (b) posterior views. This AVM is based unilaterally on the tentorial surface, is supplied by hemispheric branches of the SCA, and drains to the superior hemispheric veins that may course deeply to the VoG (anterior SHemV) or superficially to the torcula or transverse sinus (posterior SHemV).
The tentorial cerebellar AVM: (a) lateral and (b) posterior views. This AVM is based unilaterally on the tentorial surface, is supplied by hemispheric branches of the SCA, and drains to the superior hemispheric veins that may course deeply to the VoG (anterior SHemV) or superficially to the torcula or transverse sinus (posterior SHemV).

Arterial supply

  • Unilateral
  • Hemispheric branches of the SCA that intersect the anterior and medial margins of the nidus.

Venous drainage

  • Superior hemispheric vein
    • that can bridge
      • anteriorly to the Vein of Galen
      • posteriorly to Torcula
      • superiorly to Tentorial Sinus or Straight Sinus

Eloquence involvement

  • Non-eloquent.
    • Do not extend to the deep cerebellar nuclei