“…The same study showed that accuracy was lower when fetuses were < 20 weeks' gestation or < 300 g in weight. The weight of the organs measured varied between 6 and 161 g. In another study, fetal lung, brain and liver volumes were estimated at postmortem in a total of 25 fetuses at 16-40 weeks, again using conventional MRI at 1.5 T, and good correlation between volume estimate at MRI and weight estimate at postmortem was observed for the various organs studied 15 . Both previous studies mainly focused on fetuses above 20 weeks' gestation and, as for the study of Thayyil et al 5 , the smallest organ measured weighed about 6 g. In contrast, we focused on smaller fetuses, below 20 weeks' gestation, and thus on smaller organs.…”