Staged endovascular embolization treats this rare congenital brain vascular anomaly — without open brain surgery, timed carefully around the child's stability.
A Vein of Galen malformation (VGAM) is a rare congenital vascular anomaly in which arteries in the brain connect directly to a large draining vein — the vein of Galen, or more precisely its embryonic precursor, the median prosencephalic vein of Markowski — bypassing the normal capillary network entirely. Because this direct arteriovenous shunt carries blood at high pressure and high volume, it can place a severe strain on the heart, and can also disrupt normal drainage of blood from the brain.
VGAM forms during early fetal brain development and is present from birth, though its effects can appear at different ages depending on how much blood is flowing through the abnormal connection.
High-output cardiac failure — rapid breathing, poor feeding, and body swelling, a medical emergency.
An abnormally enlarging head, prominent scalp veins, hydrocephalus, and delayed developmental milestones.
A milder VGAM going unnoticed until headaches or occasionally seizures.
Cranial ultrasound with Doppler, followed by MRI and MR angiography.
A catheter is guided from the femoral artery, sometimes via a venous approach.
A liquid embolic agent progressively closes the malformation over multiple sessions.
Planned electively once the child is medically stable.
The presentation depends heavily on the age at which it's discovered:
In newborns — VGAM is the leading cause of high-output cardiac failure caused by a brain vascular malformation. The direct rush of arterial blood, bypassing the capillaries, can overwhelm a newborn's heart, causing rapid breathing, poor feeding, and generalised body swelling. This is a medical emergency requiring urgent stabilisation.
In infants — a less severe shunt may present later, with an abnormally rapidly enlarging head (macrocephaly), prominent veins visible on the scalp, hydrocephalus (fluid build-up in the brain), and delayed developmental milestones.
Rarely, in older children or adults — a milder VGAM can go unnoticed until it presents with headaches or, occasionally, seizures.
Some VGAMs are now identified on routine prenatal ultrasound before birth. After birth, cranial ultrasound with color Doppler is typically the first-line study — it's quick, accessible even for a critically unwell newborn, and can immediately confirm the diagnosis by showing the abnormal, high-flow vessel. MRI and MR angiography follow to precisely map the malformation's anatomy — which arteries feed it, how the vein drains, and whether there's any associated brain injury — all of which shapes the treatment plan.
VGAM is treated with endovascular embolization, not open brain surgery. A catheter is guided through the blood vessels — most often from the femoral artery, sometimes via a venous approach — to reach the abnormal connection, where a liquid embolic agent is injected to progressively close it off.
Two things distinguish VGAM treatment from most other embolization procedures on this site:
It's almost always staged. Rather than closing the entire malformation in one sitting, treatment is typically carried out across multiple sessions over time. This reduces the risk of suddenly redirecting a large volume of blood flow all at once, which can itself be dangerous.
Timing matters as much as technique. In a newborn in heart failure, the immediate priority is medical stabilisation of the heart and circulation. Wherever possible, embolization is planned electively once the baby is stable, rather than as an emergency procedure — emergency treatment in an unstable newborn carries meaningfully higher risk. In infants presenting later with head enlargement or developmental concerns, there is generally more time to plan the staged approach carefully.
Prognosis in VGAM depends heavily on how early it's recognised and how much strain has already been placed on the heart and brain before treatment begins. Babies who present with severe heart failure and evidence of existing brain injury on imaging face a more difficult course than those identified with a milder shunt and treated in a planned, staged way. This is precisely why prenatal or early postnatal diagnosis matters so much — it allows the malformation to be characterised and a treatment plan built before a crisis develops, rather than reacting to one. Advances in endovascular technique and liquid embolic agents over the past two to three decades have meaningfully improved survival and long-term neurological outcomes compared to older surgical approaches, though VGAM remains a condition that requires careful, individualised management rather than a one-size-fits-all protocol.
Because VGAM affects the heart, the brain, and — in delayed presentations — a child's development, safe management depends on close coordination between paediatric cardiology or neonatology, interventional neuroradiology, and paediatric neurosurgery. Outcomes have improved substantially over the past few decades as endovascular techniques have advanced, but VGAM remains a serious, rare condition that needs to be managed at a centre equipped for both the neurological and cardiac aspects of care.
Blood flows directly from artery to vein at high pressure, bypassing the capillary network that normally regulates flow. In a newborn, this extra volume can overwhelm the heart, causing rapid breathing and body swelling — a medical emergency requiring urgent stabilisation.
No — in a newborn with heart failure, medical stabilisation of the heart comes first. Embolization is generally planned electively once the baby is stable, since emergency treatment in an unstable newborn carries higher risk.
Closing the entire malformation in one sitting can suddenly redirect a large volume of blood flow, which is itself risky. A staged approach over multiple sessions allows the brain and heart to adjust gradually and more safely.
Yes — a milder shunt may not cause obvious problems as a newborn, but can present later in infancy with a rapidly enlarging head, prominent scalp veins, or developmental delay, or rarely even later with headaches.
Book a consultation with Dr. Giragani to discuss a coordinated treatment plan.