*2.3.2. Heritable causes*

About 10% of all individuals with CDH have a chromosome abnormality. The most common abnormalities are trisomy 18 and isochromosome 12p (Pallister-Killian syndrome or PKS), although many additional abnormalities have been reported (**Table 1**). Some of the more common monogenic syndromes in which CDH occurs are listed in (**Tables 2** and **3**) [4].
