Vitelline cyst in the rat ileum

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  • Oshikata Takafumi
    LSI Medience Corporation, 1285 Kurisaki-machi, Uto, Kumamoto 869-0425, Japan
  • Kobayashi Azusa
    LSI Medience Corporation, 1285 Kurisaki-machi, Uto, Kumamoto 869-0425, Japan
  • Kumabe Shino
    LSI Medience Corporation, 1285 Kurisaki-machi, Uto, Kumamoto 869-0425, Japan
  • Kawasako Kazufumi
    LSI Medience Corporation, 1285 Kurisaki-machi, Uto, Kumamoto 869-0425, Japan
  • Katoku Koshirou
    LSI Medience Corporation, 1285 Kurisaki-machi, Uto, Kumamoto 869-0425, Japan
  • Mitsuishi Mikio
    LSI Medience Corporation, 1285 Kurisaki-machi, Uto, Kumamoto 869-0425, Japan
  • Kanno Takeshi
    LSI Medience Corporation, 1285 Kurisaki-machi, Uto, Kumamoto 869-0425, Japan
  • Hamamura Masao
    LSI Medience Corporation, 1285 Kurisaki-machi, Uto, Kumamoto 869-0425, Japan

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Description

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.

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