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Mature duodenal teratoma in a neonate with exomphalos minor with intestinal obstruction: first case report.

A congenital hernia into the base of the umbilical cord is known as an exomphalos and when the size of the defect is 5 cm or less and containing only bowel, it is called as exomphalos minor.1,2 Exomphalos probably results from failure ofmidline fusion ofmesodermalmyotomes; therefore, it is associated with major congenital malformations.2 Gastrointestinal (GI) tract anomalies such as atresias, duplication cysts, Meckel diverticulum, etc., are more likely to be associated with exomphalos minor.2 In exomphalos obstruction due to either associated atresia or volvulus due tomalrotation or iatrogenic due to accidental inclusion of the small bowel while clamping the umbilical cord has been reported, but exomphalos minor per se as the sole cause of obstruction is extremely rare.3–5 A teratoma is a primary germ cell neoplasm that is composed of well-differentiated tissue derived from embryonic germ cell layers.6 It is a benign neoplasm that can occur in many locations, but are most commonly seen in the gonads, head, neck, anteriormediastinum, sacrococcygeal area, retroperitoneum, and central nervous system. Teratomas have also been reported throughout the GI tract and associated organs, including the stomach, cecum, rectum, and pancreas.7 Foregut teratomas are extremely rare, mostly arising from the stomach.8 Duodenal teratomas appear to be extremely rare and are yet to be described.