[Operation for infratentorial arteriovenous malformations]

Area of Science:

• Neurosurgery
• Vascular Neurology
• Neuroradiology

Context:

• Infratentorial arteriovenous malformations (AVMs) present unique surgical challenges.
• Understanding vascular anatomy, including parent and proper feeders/drainers, is crucial for AVM resection.
• Previous literature lacks detailed surgical strategies for specific infratentorial AVM locations.

Purpose:

• To describe and discuss surgical approaches, technical standards, and difficulties for three representative infratentorial AVM localizations.
• To differentiate between parent and proper feeders/drainers for precise AVM dissection.
• To propose and evaluate surgical strategies for complex AVMs in the cerebellopontine angle and cerebellar vermis.

Summary:

• The study categorizes feeding arteries into parent and proper feeders, and draining veins into parent and proper drainers, emphasizing dissection at proper feeders and drainers.
• Tonsillar AVMs have a straightforward surgical approach with PICA as the principal feeder and inferior vermian vein as the parent drainer.
• Cerebellopontine angle AVMs pose challenges due to feeder complexity, adherence to cranial nerves VII/VIII, and pons involvement, sometimes requiring subtotal resection. Cerebellar vermis AVM surgery is controversial, with three approaches discussed: subtemporal transtentorial, suboccipital transtentorial, and infratentorial supracerebellar.

Impact:

• Provides a refined classification of vascular supply and drainage for infratentorial AVMs.
• Offers practical guidance on surgical techniques and problem-solving for specific AVM locations.
• Contributes to the neurosurgical management of complex posterior fossa AVMs, potentially improving patient outcomes.