<unk>  (CRS) is a congenital disorder with unknown cause. Because of the unknown cause there are many different, and sometimes incorrect names. It is a malformation due to intrauterine bands or<unk> s that give deep grooves in, most commonly, distal extremities like fingers and toes. In rare cases the<unk> <unk>  can form around other parts of the fetus and cause amputation or even intrauterine death. The anatomy proximal to the site of<unk>  (or amputation) is developmentally normal. CRS can be associated with other malformations with club foot being most common. The precise configuration of the bands, lymphedema, and character of the amputations are not predictable and vary with each individual patient. Also more than one extremity is usually affected, and it is rare for only one<unk>  to present as an isolated malformation with no other manifestation of this syndrome.
Constriction ring syndrome
Jordans' anomaly
Saal Greenstein syndrome
Ebstein's anomaly
Spigelian hernia
Situs inversus
Intersection syndrome
Heerfordt syndrome