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The abdominal radiograph (fig 1) shows contrast material in the small bowel after injection through a fourth lumen found in the transected umbilical cord of an infant born at 28 weeks gestation (in vitro fertilisation), consistent with a patent omphalomesenteric duct.
When the infant was 3 months old, the umbilical skin was completely closed leaving a 1.5 cm umbilical hernia. Exploratory surgery was performed. Neither patent omphalomesenteric duct nor its fibrous remnant were present.
A Meckel's diverticulum was found 40 cm from the ileocaecal junction (fig 2). A Meckel's diverticulectomy was performed. The period after the operation was uneventful.
Patent omphalomesenteric duct accounts for about 2% of omphalomesenteric duct malformations1 and should be suspected in the presence of an umbilical discharge, umbilical granuloma not responding to silver nitrate cauterisation, or in the presence of an additional non-vascular lumen in a transected umbilical cord. Prompt surgical repair minimises the risk of intestinal obstruction and prolapse of the ileum through the fistula. Only one similar case of spontaneous postnatal regression of a patent omphalomesenteric duct was found in the literature.2
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