To determine whether prenatal sonographic features of the small bowel can accurately predict postnatal outcome in fetuses with gastroschisis, the sonograms of 24 fetuses with prenatally detected gastroschisis were retrospectively reviewed for fetal bowel features including small bowel dilatation and bowel wall thickening. To identify a relationship between the sonographic features and neonatal outcome, each feature was analyzed against eight adverse clinical outcome measures including bowel obstruction or atresia, necrosis, and need for bowel resection, using chi‐square analysis and Kendall's taub correlation. When a relationship was identified, the sensitivity and specificity of the sonographic feature for predicting adverse outcome were determined. Only maximum small bowel diameter was related to postnatal bowel complications. Significantly more fetuses with a maximum small bowel diameter of greater than 11 mm (7/12) had bowel complications than did fetuses with MBD 11 mm or less (2/12) P < 0.05). Using a cutoff point of greater than 11 mm for maximum small bowel diameter, the sensitivity was 78%, specificity 66%, and positive predictive value 71% for predicting postnatal bowel complications. However, in only seven of 24 cases did the two observers make the same maximum small bowel diameter measurement, and in 14 of 24 cases their measurements differed by 2 mm or more. The observers varied sufficiently in their measurements to shift three fetuses (13%) between categories (< or = 11 mm or > 11 mm). Although a maximum small bowel diameter of 11 mm stratified our fetuses, this measurement may not be clinically meaningful.

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The prevalence of VM in fetuses with myelomeningoceles varies with both GA and the severity of the associated PF deformity. These observations may provide additional prognostic information once a myelomeningocele is detected at sonography.

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Direct correlation of MR images of fetuses during the late first and early second trimesters with anatomic atlases could result in a mistaken diagnosis of delayed or abnormal development of the posterior fossa contents because of a time lag in the detection of structures on MR images. An MR template of normal cerebellar development would be useful to avoid confusion of normal development with abnormal development and to identify the expected developmental features when provided the estimated gestational age of a fetus.

Important aspects of fetal midface anatomy that relate to facial clefts can be observed in utero at prenatal sonography in the coronal and axial planes.