title: Histology of a paraumbilical band in a neonate with gastroschisis.
abstract: We report a case of gastroschisis in which a paraumbilical band was found at the right margin of the abdominal wall defect and extended into the antimesenteric side of the small intestine. The band consisted of 2 thin cords. Microscopically, 1 band showed a fibrous tissue, and the other 1 revealed a unique vascular structure resembling the vitelline artery and vein, suggesting that the paraumbilical band represents a remnant of the yolk stalk that failed to be incorporated into the umbilical stalk. The origin of the paraumbilical band and an associated pathogenetic hypothesis of gastroschisis are discussed.
authors.affiliation: Department of Pathology and Laboratory Medicine, Tokyo Metropolitan Children's Medical Center, Tokyo, Japan. ryuji.fukuzawa@1998.jukuin.keio.ac.jp
authors.forename: Ryuji
authors.initials: R
authors.lastname: Fukuzawa
authors.forename: Miki
authors.initials: M
authors.lastname: Toma
authors.forename: Aya
authors.initials: A
authors.lastname: Nomura
mesh_terms: D000009:Abdominal Muscles / Q000002:abnormalities* / Q000601:surgery; D020139:Gastroschisis / Q000473:pathology* / Q000601:surgery; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D016896:Treatment Outcome; D014470:Umbilical Cord / Q000002:abnormalities* / Q000601:surgery; D014817:Vitelline Membrane / Q000002:abnormalities; D015017:Yolk Sac / Q000002:abnormalities