Cerebral arteriovenous malformation presenting as visual deterioration in a child

Area of Science:

• Neuro-ophthalmology
• Pediatric Neurology
• Vascular Neurology

Background:

• Central arteriovenous malformations (AVMs) involving the vein of Galen are rare but serious vascular anomalies.
• Visual disturbances can be a presenting symptom, though less common than other neurological deficits.
• Early diagnosis and understanding of the pathophysiology are crucial for managing these complex cases.

Observation:

• A 5-year-old girl presented with a 6-month history of progressive vision deterioration.
• Ocular examination revealed left hemianopia, left optic atrophy, and dilated vessels on the right optic disc.
• Magnetic Resonance Imaging (MRI) identified a large, deep-seated central AVM involving the vein of Galen.

Findings:

• The patient's visual loss was attributed to a combination of factors.
• Ischemic optic atrophy resulted from a steal phenomenon, where the AVM diverts blood flow away from the optic nerve.
• Direct compression of the right optic radiation by the AVM also contributed to the visual field deficit.

Implications:

• This case highlights the importance of considering central AVMs in pediatric patients with unexplained visual loss.
• Understanding the dual mechanism of ischemic and compressive effects is key to diagnosing and treating such conditions.
• Further research into the neurovascular dynamics of vein of Galen AVMs can improve patient outcomes.