This explains differences between the Prrx1Cre;Gata4 fl/fl model of Merrell et al. (bilateral, with membranous sac and defects of muscularization) and our WT1 model, much more similar to the human Bochdalek hernia (left-sided and with discontinuity of the pleuroperitoneal septum). This evidence concerns the gene WT1 and Posterolateral diaphragmatic hernia.