title: Vitelline cyst in the rat ileum.
abstract: Congenital vitelline duct anomalies other than Meckel's diverticulum are rare in animals. A cyst of approximately 8 mm in diameter was observed on the antimesenteric surface of the ileal serosa in a 10-week-old female Crl:CD(SD) rat. Microscopically, the cyst closely resembled the ileum, but it did not communicate with the ileal lumen. We diagnosed this case as a vitelline cyst derived from the vitelline duct based on the location where it developed and its histological behavior. In rats, only Meckel's diverticulum has been reported with a congenital anomaly of the vitelline duct, and no other spontaneous anomalies including a vitelline cyst have been reported. This case may be the first report concerning a vitelline cyst in the rat ileum.
authors.affiliation: LSI Medience Corporation, 1285 Kurisaki-machi, Uto, Kumamoto 869-0425, Japan.
authors.forename: Takafumi
authors.initials: T
authors.lastname: Oshikata
authors.affiliation: LSI Medience Corporation, 1285 Kurisaki-machi, Uto, Kumamoto 869-0425, Japan.
authors.forename: Azusa
authors.initials: A
authors.lastname: Kobayashi
authors.affiliation: LSI Medience Corporation, 1285 Kurisaki-machi, Uto, Kumamoto 869-0425, Japan.
authors.forename: Shino
authors.initials: S
authors.lastname: Kumabe
authors.affiliation: LSI Medience Corporation, 1285 Kurisaki-machi, Uto, Kumamoto 869-0425, Japan.
authors.forename: Kazufumi
authors.initials: K
authors.lastname: Kawasako
authors.affiliation: LSI Medience Corporation, 1285 Kurisaki-machi, Uto, Kumamoto 869-0425, Japan.
authors.forename: Koshirou
authors.initials: K
authors.lastname: Katoku
authors.affiliation: LSI Medience Corporation, 1285 Kurisaki-machi, Uto, Kumamoto 869-0425, Japan.
authors.forename: Mikio
authors.initials: M
authors.lastname: Mitsuishi
authors.affiliation: LSI Medience Corporation, 1285 Kurisaki-machi, Uto, Kumamoto 869-0425, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kanno
authors.affiliation: LSI Medience Corporation, 1285 Kurisaki-machi, Uto, Kumamoto 869-0425, Japan.
authors.forename: Masao
authors.initials: M
authors.lastname: Hamamura
keywords: Meckel’s diverticulum; ileum; rat; vitelline cyst; vitelline duct