CONGENITAL ANTRAL MEMBRANE

CONGENITAL DIAPHRAGM / WEB

Congenital antral membrane (web or diaphragm) is a rare cause of prepyloric gastric outlet obstruction. Although congenital, it usually presents in infants and children (1), however in 50% of newborns with a completely obstructed diaphragm, polyhydramnios was present but no mention was made of a dilated gastric bubble (2).

• Usually located 1-3 cm proximal to the pyloroduodenal junction.
• The membrane is thin, soft and pliable and composed of mucosa and submucosa.
• Orifice is 2-3mm wide.

ULTRASOUND

• Dilated stomach.
• Polyhydramnios.
• No "double bubble".
• Normal small bowel loops in the fetal abdomen.

	Market gastric distention No double bubble No flow of fluid through the pylorus on power Doppler Pathologically proven duodenal web

ASSOCIATED CONDITIONS

• Pyloric stenosis.
• Cardiovascular malformations.

REFERENCES

1. Lugo-Vicente HL. Congenital (prepyloric) antral membrane: Prenatal diagnosis and treatment. J Pediatr Surg 1994;29(12):1589-1590.
2. Gerber BC. Prepyloric diaphragm, an unusual abnormality. Arch Surg 1965;90:472-480.