Congenital-Onset Steinert Myotonic Dystrophy, is also known as congenital-onset myotonic dystrophy type 1. An important gene associated with Congenital-Onset Steinert Myotonic Dystrophy is DMPK (DM1 Protein Kinase). Affiliated tissues include eye, and related phenotypes are macrocephaly and tented upper lip vermilion