Template:Trisomy 18 features table

Frequency	Organ/System	Prevalent type of malformation
Common (>75%)	heart	septal defects, patent ductus arteriosus, and polyvalvular disease
Frequent (25-75%)	genitourinary	horseshoe kidney
Less frequent (5-25%)	gastrointestinal central nervous system craniofacial eye limb	omphalocele, esophageal atresia with tracheo-esophageal fistula, pyloric stenosis, Meckel diverticulum cerebellar hypoplasia, agenesis of corpus callosum, polymicrogyria, spina bifida orofacial clefts microphthalmia, coloboma, cataract, corneal opacities radial aplasia/hypoplasia
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