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Fig. 1C —Fetus at 33 weeks of gestation. Transverse MR images obtained with true fast imaging with steady-state precession sequence and used for fetal lung volume assessment show fetal lung differentiated from heart (single asterisk) and herniated abdominal contents including fetal liver (double asterisk). Region of interest follows lung boundaries and does not include main vessels of pulmonary hila. Regions of interest with lung planimetry are shown in B and D.