<unk>  is a rare congenital medical condition caused by an abnormality involving chromosome 18.  It has two forms, classified as type 1 or type 2,<unk> pending on the nature of the genetic lesion.<unk>  type 1 involves<unk> letion of genes from the short arm of the chromosome (18p).<unk>  type 2 occurs when the long arm of the chromosome is affected (18q). It manifests clinically as mental retardation, short stature, hypotonia, hearing impairment, and foot<unk> formities. Tapered digits and wide mouth have been<unk> scribed. Approximately 80% of individuals affected by the syndrome are below the fifth centile in height.
De Grouchy Syndrome
Achard-Thiers Syndrome
Lethal congenital contracture syndrome
Gourmand Syndrome
Currarino syndrome
Avellis syndrome
Lockwood-Feingold syndrome
Greig cephalopolysyndactyly syndrome