ELN and Aortic root aneurysm: Despite the unexpectedly increased carotid elasticity in the Morquio A cohort, the cohort’s high prevalence of aortic root dilatation (56%), comparable to the 69% (11 of 16) prevalence in an independently ascertained Morquio A cohort [27] and a high prevalence in older Morquio A patients [7] comprise evidence that pathology of arterial elastin in Morquio A has clinical significance.