The blood vessel formations associated with<unk> S start in the fetal stage. Around the sixth week of development, a network of nerves develops around the area that will become a baby's head. Normally, this network goes away in the ninth week of development. In babies with<unk> S due to mutation of gene GNAQ, this network of nerves doesn't go away. This reduces the amount of oxygen and blood flowing to the brain, which can affect brain tissue development.
Sturge–Weber syndrome
TORCH syndrome
Pelger–Huët anomaly
Schinzel–Giedion syndrome
Cohen-Gibson syndrome
Letterer–Siwe disease
Cornelia de Lange syndrome
Pelizaeus–Merzbacher disease