A congenital malformation of blood vessels of
the brain. Specifically, an arteriovenous (AV) malformation in which blood
shunts from cerebral arteries into a dilated vein of Galen (an internal cerebral
vein).
In newborns this shunt can cause high cardiac output and heart failure. In
infants this AV malformation can obstruct the Aqueduct of Sylvius, a necessary
channel for the flow of cerebrospinal fluid, and cause hydrocephalus. In older
children it can seizures (epileptic fits), a stroke, or learning difficulties.
Treatment is catheterization to deposit a glue in the shunt to shut it off.
Several of these embolizations procedures may be needed to shut off all the
vascular communications. This is usually done over a period of months before the
child is two years old.
The term "vein of Galen aneurysm" is hallowed by usage, although this is
really not an aneurysm but rather an AV malformation. It also known as a
Galenic arteriovenous malformation.
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