Table 2 Differential diagnosis of megaduodenum
From: Prenatal diagnosis of megaduodenum using ultrasound: a case report
Differential diagnosis | Time of discovery | Stomach size | Communication between the mass and stomach | Amniotic fluid | Mass characteristics | Other manifestations on ultrasound |
|---|---|---|---|---|---|---|
Megaduodenum | Can be found during early pregnancy | Normal | Yes | Normal | Enlargement with gestational week, irregular shape, echogenic wall | – |
Usually found during the second trimester | Dilated | Yes | Often accompanied by polyhydramnios | Spherically dilated duodenum | “Double-bubble” sign, a shriveled bowel can sometimes be observed at the distal end | |
Mid-to-late pregnancy | Normal | No | Often accompanied by polyhydramnios | Large cystic mass with echogenic walls and some septa | Ascites, scattered intra-abdominal calcifications |