<unk> s are rare congenital malformations that result from defective embryologic fusion of paired mesodermal bands in the ventral midline. They may be associated with other midline defects (as in pentalogy of Cantrell). It may also occur in isolation.<unk>  is treated by surgery in early life to avoid fixation leading to immobility.
Sternal cleft
Laryngeal cleft
Nuchal lines
Midline cervical cleft
Meckelian groove
Pterygium 
Pterygium
Retrocuspid papilla