Fig. 2

The o/e LHR is calculated by taking the ratio of the lung area divided by the head circumference, compared to a reference value for that gestational age. a Head circumference. b Lung area and diameter measured in the plane of the four-chamber view, the lung is posterior to the heart. c Survival rates of fetuses with left-sided CDH expectantly managed during pregnancy, as a function of different o/e LHR and liver position. d Same, for fetuses with right-sided CDH. Yellow arrows indicate improved survival after FETO as reported by Jani et al. 2006 (left CDH) and DeKoninck et al. 2014 (right CDH) [11, 26]. Adapted, with permission, from Russo et al. 2017 [27]