Extralobar pulmonary sequestration in two pinniped species

Two cases of extralobar pulmonary sequestrations from a walrus (Odobenus rosmarus) and a Steller sea lion (Eumetopias jubatus) are described in the present study. Grossly, an independent, soft unilocular cystic mass was found within the abdominal cavities of both animals, adherent to the diaphragm i...

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Bibliographic Details
Published in:Journal of Veterinary Medical Science 2017, Vol.79(11), pp.1791-1794
Main Authors: NAKAGUN, Shotaro, WATANABE, Hirotaka, OCHIAI, Kenji, KOHYAMA, Kaoru, GOSHIMA, Wataru, GOTO, Yoko, KOBAYASHI, Yumi, WATANABE, Kennichi, HORIUCHI, Noriyuki, SASAKI, Jun, GORYO, Masanobu, KOBAYASHI, Yoshiyasu
Format: Article
Language:English
Subjects:
Alveoli
Aquatic mammals
Arteries
Cartilage
Congenital anomalies
congenital anomaly
cystic mass
Cysts
Diaphragm
ectopic lung
Epithelium
extralobar pulmonary sequestration
Glands
Goblet cells
Muscles
Odobenus rosmarus
Pathology
pinniped
Stomach
Wildlife
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Summary:Two cases of extralobar pulmonary sequestrations from a walrus (Odobenus rosmarus) and a Steller sea lion (Eumetopias jubatus) are described in the present study. Grossly, an independent, soft unilocular cystic mass was found within the abdominal cavities of both animals, adherent to the diaphragm in O. rosmarus and attached to the cardia of the stomach in E. jubatus. Histopathologically, the cysts were lined by pseudostratified ciliated columnar epithelium with abundant goblet cells, while the wall comprised of glands, hyaline cartilage, bronchiole- and alveolus-like structures, smooth muscles, and large, well-developed elastic and muscular arteries. The pinniped cases presented are exceptionally rare and to the best of the authors’ knowledge, marks the first descriptions of this congenital anomaly in wildlife.
ISSN:0916-7250
1347-7439
DOI:10.1292/jvms.17-0429