[Trisomy 18 or postnatal Edward´s syndrome: descriptive study conducted at the University Hospital Center of Casablanca and literature review].

Trisomy 18 is a chromosomal disease, caused by the presence of a supernumerary chromosome 18. Mortality among infants with trisomy 18 is high, secondary to lethal malformations associated with this syndrome. The purpose of this study was to describe the clinical and cytogenetic features of these patients, as well as the role of genetic counselling.