Genetics Home Reference: Periventricular heterotopia http://ghr.nlm.nih.gov/condition/periventricular-heterotopia Genetics Home Reference: Periventricular heterotopia http://ghr.nlm.nih.gov/condition/periventricular-heterotopia Genetics Home Reference periventricular heterotopia http://ghr.nlm.nih.gov/condition/periventricular-heterotopia Genetics Home Reference Genetics Home Reference’s