X-linked intellectual disability-hypotonia-facial dysmorphism-aggressive behavior syndrome

What it is

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.

Key facts

Prevalence

<1 / 1 000 000

Age of onset

Childhood, Infancy

Inheritance

X-linked recessive

Classified as

Malformation syndrome

Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.

Signs and symptoms

These ranges are how often a sign appears across everyone diagnosed, not a prediction for one person — most people have some of these and not others. Orphanet also records findings that are specifically absent in this disease; those are in the data but not listed here.

Gene

ICD-10 codes

ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.

Related health topics

Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.

Cross-references