A severe fetal malformation syndrome with characteristics of craniofacial dysmorphic features, central nervous system, cardiac, respiratory tract and limb abnormalities. Mostly present in families of Finnish descent. The syndrome also has characteristics of postaxial and preaxial polydactyly. Caused by mutations in HYLS1 (11q24.2) and KIF7 (15q26.1). Inheritance is autosomal recessive. Stillbirth or neonatal death is the rule, although rare cases with several months of survival have been reported.