12p12.1 microdeletion syndrome

What it is

A rare chromosomal anomaly syndrome, resulting from the partial deletion of the short arm of chromosome 12, characterized by intellectual disability, global developmental delay with prominent language impairment, behavioral abnormalities and mild facial dysmorphism (incl. frontal bossing, downslanting palpebral fissures, epicanthal folds, broad, depressed nasal bridge with bulbous nasal tip, low-set ears with underdeveloped helices). Other associated features may include skeletal abnormalities (butterfly vertebrae, scoliosis), strabismus, optic nerve hypoplasia, and brain malformations.

Key facts

Prevalence

<1 / 1 000 000

Age of onset

Infancy, Neonatal

Inheritance

Autosomal dominant, Not applicable

Classified as

Clinical subtype

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.

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