Arteriovenous malformation

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[edit] Discussion

  • Arteriovenous malformation (AVM) is a congenital cerebral vascular malformation consisting of:
    • Feeding artery or arteries
    • Core/Nidus
    • Enlarged draining vein or veins
  • Complications
    • Hemorrhage (4% per year)
    • Steal phenomenon: blood seeks AVM and normal brain paranchyma is inadequately supplied

[edit] Spetzler-Martin Grading System

Size Eloquence of adjacent brain Venous drainage
Small (<3 cm)1Noneloquent0Superficial only 0
Medium (3-6 cm)2Eloquent1Deep component 1
Large (>6 cm)3
  • Size: Measure the largest diameter of the nidus of the lesion on angiography.
  • Eloquence: Eloquent areas include sensorimotor, language, visual, thalamus, hypothalamus, internal capsule, brain stem, cerebellar peduncles, and deep cerebellar nuclei.
  • Venous drainage: The lesion is considered superficial only if all drainage is via the cortical drainage system.

[edit] Imaging Findings

[edit] Images

Patient #1: MRI demonstrates a large right AVM

[edit] See Also

[edit] External Links

[edit] References