Loeys-Dietz syndrome is a recently-discovered autosomal dominant genetic syndrome which has many features similar to Marfan syndrome, but which is caused by mutations in the genes encoding transforming growth factor beta receptor 1 (TGFBR1) or 2 (TGFBR2). It was identified and characterized by American physician Harry C. Dietz and Belgian physician Bart L. Loeys, for whom it is named.
From: Wikipedia: Loeys-Dietz Syndrome