Gray matter heterotopia are common malformations of cortical development.

Grey matter heterotopia is such an error.

In neuropathology, for example, gray matter heterotopia, is the presence of gray matter within the cerebral white matter or ventricles.

In general, gray matter heterotopia is fixed in both its occurrence and symptoms; that is, once symptoms occur, it does not tend to progress.

Gray matter heterotopia (singular heterotopion) is a neurological disorder caused by clumps of grey matter being located in the wrong part of the brain.

It is believed grey matter heterotopia is caused by arrested migration of neurons to the cerebral cortex; that is, when neurons that are supposed to form part of the cerebral cortex, fail to climb to the end of their ladder correctly and are permanently situated in the wrong location.