ICD-11 definition : Williams syndrome is a rare genetic disease characterised by a developmental disorder
associating a cardiac malformation (most frequently supra valvular aortic stenosis,
SVAS) in 75% of cases, psychomotor retardation, a characteristic facial dysmorphism
and a specific cognitive and behavioural profile.;
ICD-11 synonym : 7q11.23 deletion; Monosomy 7q11.23; Williams syndrome;
Williams syndrome is a rare genetic disease characterised by a developmental disorder
associating a cardiac malformation (most frequently supra valvular aortic stenosis,
SVAS) in 75% of cases, psychomotor retardation, a characteristic facial dysmorphism
and a specific cognitive and behavioural profile.