<prompt> All of the following statements regarding Sturge weber syndrome are true, EXCEPT:Characterised by nevus flammeusDiffuse choroidal hemangioma may be seen in upto 40 of the casesUp to 85 of individuals may suffer from seizure disorderMental retardation is seen in only less the 15 of the individuals  <response>: Mental retardation is seen in 60 cases of Sturge weber syndrome. It is an nonfamilial disease characterised by the presence of nevus flammeus on one side of face. 40 of patients with po wine stain develop choroidal hemangioma. They also develop leptomeningeal angiodysplasia of brain and meninges resulting in seizures 85, mental retardation and cerebral atrophy. 