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| Case report | Age and sex | Clinical presentation | Clinical findings | Radiological findings | Surgical findings |
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| Bahador and bagheri [12] | 2 days, male | Bilious vomiting and failure to pass meconium | — | Plain X-ray: distended stomach pneumatosis of duodenal wall
Upper GI contrast study: incomplete duodenal obstruction | Duodenal obstruction due to duodenal web |
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| Alvarez et al. [6] | 20 days, female | Nonbilious vomiting for 24 hours | Mildly dehydrated; abdominal examination: abdominal distension; biochemical investigations: moderate metabolic alkalosis | Plain X-ray: distended stomach and duodenum, gastric emphysema; USS abdomen: echogenic foci with reverberation in the gastric wall; upper GI contrast study: thin, partially obstructing web at the second part of the duodenum | Duodenal diaphragm with a central aperture |
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| Kawano et al. [2] | 7 months, male | Progressive vomiting and abdominal distension in a Down’s syndrome baby | Abdominal examination: upper abdominal distension; biochemical investigations: normal | Plain X-ray: gastric pneumatosis, dilated duodenum; duodenography: membranous stenosis of the second part of the duodenum | Thick membrane with a pinhole in the second part of the duodenum, associated malrotation |
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| Fernandes and smith [10] | 8 months, female | Progressive nonbilious, nonprojectile milk regurgitation in a Down’s syndrome baby | Abdominal examination: normal; biochemical investigations: metabolic alkalosis, hyponatraemia, hypokalaemia | Plain X-ray: gastric emphysema; CT abdomen: gastric emphysema, partial distal duodenal obstruction | Partial duodenal obstruction secondary to duodenal stenosis |
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| Gupta [13] | 9 months | Projectile vomiting in a Down’s syndrome baby | Abdominal examination: distension of the epigastrium with visible peristalsis; biochemical investigations: normal | Plain X-ray: distension of the stomach with an unusual translucent “halo” around the stomach.
Barium meal: distended stomach, gas in the stomach wall | Thick-walled muscular septum with a small opening in the centre |
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| D’Cruz and Emil [1] | 9 months, female | Progressive worsening of projectile vomiting for 5 days in a Down’s syndrome baby | Lethargic and dehydrated; abdominal examination: normal; biochemical investigations: severe hypokalaemic, hypochloraemic, metabolic alkalosis | Plain X-ray: gastric emphysema; CT abdomen: partial duodenal obstruction, gastroduodenal emphysema | Partial duodenal obstruction secondary to a web in the proximal second portion of the duodenum |
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| Thacker et al. [14] | 10 months, female | Insidious onset of bilious vomiting for 2 days | Lethargic and dehydrated; biochemical investigations: normal | Plain X-ray: grossly distended stomach with intramural gas, pneumoperitoneum | Duodenal web at D4, severe diffuse gastritis with sloughing of mucosa and ulceration in intraoperative gastroscopy |
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| Present case | 18 months, male | Progressive, nonbilious vomiting and abdominal distension for 2 days | Mildly dehydrated; abdominal examination: abdominal distension; biochemical investigations: normal | USS abdomen: multiple echogenic foci in the portal vein; plain X-ray: grossly distended stomach and proximal duodenum with gastroduodenal emphysema; upper GI contrast study: gastroduodenal pneumatosis, windsock deformity | Duodenal web with windsock deformity |
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