X-Linked Intellectual Disability-Hypotonia-Facial Dysmorphism-Aggressive Behavior Syndrome

A rare X-linked syndromic intellectual disability characterized by severe to profound intellectual disability, muscular hypotonia in childhood, delayed walking, delayed or minimal/absent speech, behavioral abnormalities including aggressiveness, agitation, and self-injurious behavior, and dysmorphic facial features (such as triangular face with high forehead, prominent ears, and small, pointed chin). Additional reported manifestations include microcephaly, short stature, and seizures, among others.