Most cases of<unk>  are idiopathic (no known cause). However, some cases have been described with a genetic linkage to a locus at Xq25-q26.1.
Pentalogy of Cantrell
Meromelia
Sirenomelia
Rhizomelia
Singleton Merten syndrome
Ghosal hematodiaphyseal dysplasia
Pseudo-Hurler polydystrophy
Mesomelia