A rare X-linked syndromic intellectual disability which in symptomatic, female carriers has characteristics of a highly variable phenotype including facial dysmorphism (prominent forehead, hypertelorism, down-slanting palpebral fissures, epicanthic folds, thick lips with everted lower vermilion, thick nasal alae and septum), short hands with tapering fingers, short stature and skeletal findings (progressive kyphoscoliosis). Intellectual disability is mild to moderate, but intellect can also be normal. A high rate of psychiatric disorders has also been reported. [from SNOMEDCT_US]