A rare chromosomal anomaly syndrome, resulting from the partial deletion of the long arm of chromosome 2, with a highly variable phenotype typically characterised by severe intellectual disability, moderate to severe developmental delay (particularly speech), feeding difficulties, failure to thrive, hypotonia, thin, sparse hair, various dental abnormalities and cleft/high-arched palate. Typical dysmorphic features include high, prominent forehead, down-slanting palpebral fissures and prominent nasal bridge with beaked nose. Various behavioural problems (e.g. hyperactivity, chaotic/repetitive behaviour, touch avoidance) are also associated. [from
SNOMEDCT_US]