Fetal Gastrointestinal Obstruction Imaging Differentiation

Step-by-step decision

Choose step by step as prompted; reaching an endpoint gives the management recommendation. You can go back a step or restart anytime.

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Full pathway

1. [Decision] Dilation site/double-bubble + calcification + fluid/associated
   Dilation site/double-bubble + calcification + fluid/associated? (Fetal gastrointestinal obstruction. MRI meconium T1-high signal helps localize the obstruction level. Polyhydramnios (more marked the more proximal). Check associated anomalies and chromosomes.)
   • Double-bubble sign (stomach + duodenal bulb dilation) + polyhydramnios (duodenal atresia) → Duodenal atresia double-bubble · check Down
   • Multiple dilated bowel loops + polyhydramnios (jejunoileal atresia) → Jejunoileal atresia
   • Extraluminal calcification + ascites + pseudocyst (meconium peritonitis/perforation) → Meconium peritonitis · check CF
   • Lower pelvic bowel dilation bilobed sign ± intraluminal calcification (anal atresia/low) → Anal atresia/low · check VACTERL
2. [End] Duodenal atresia double-bubble · check Down
   Duodenal atresia double-bubble sign (connected stomach + duodenal bulb dilation) + polyhydramnios: ~30% Down → karyotype/microarray + VACTERL/cardiac screen; serial fluid monitoring (amnioreduction if needed); deliver at a specialist center, postnatal surgery.
3. [End] Jejunoileal atresia
   Jejunoileal atresia (multiple dilated bowel loops >7 mm, peristaltic) + polyhydramnios (more proximal = more fluid): mostly isolated, of vascular-event origin; monitor bowel dilation/perforation/fluid; postnatal pediatric surgery (anastomosis); check for meconium peritonitis signs.
4. [End] Meconium peritonitis · check CF
   Meconium peritonitis/meconium pseudocyst (bowel perforation → extraluminal calcification 85% + ascites + pseudocyst + polyhydramnios): check cystic fibrosis (CF); some perforations self-heal without atresia; monitor progression, postnatal surgical assessment by bowel status.
5. [End] Anal atresia/low · check VACTERL
   Anal atresia/low obstruction (lower pelvic bowel dilation bilobed sign ± intraluminal calcification): often VACTERL/cloacal malformation → detailed survey of spine/heart/kidneys/limbs + karyotype; MRI to assess pelvic anatomy and fistula; deliver at a specialist center, postnatal surgery.

Source guidelines & references

• Fetal gastrointestinal obstruction prenatal imaging (double-bubble sign/meconium peritonitis calcification; MRI meconium signal)

This pathway is our own synthesis of the decision logic in the guidelines above (not the guideline verbatim); thresholds and workflows change as guidelines update — in practice follow the latest guideline, your institution's protocol and the individual patient.

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