FGF23 and aneurysm: In this study we have investigated the genetic variation in the FGF23 gene in a cohort of 84 children with KS and its correlation with serum FGF23 levels and development of CaA: we have found a significant correlation between the FGF23 rs3832879 variant (which can be found in 15.6% of the population; http://www.ncbi.nlm.nih.gov/snp/?term=rs3832879) and both serum FGF23 levels and CaA, including both coronary artery dilatations and aneurysms.