Zygomycotic Mediastinal Lymphadenitis in Beef Cattle with Ruminal Tympany

A 9-month-old steer was autopsied due to recurrent ruminal tympany. A macroscopic examination found an enlarged caudal mediastinal lymph node, and a section of the lymph node revealed necrosis with marked calcification, similar to tuberculous lymphadenitis. Histopathologically, the lesion consisted...

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Bibliographic Details
Published in:	Journal of Veterinary Medical Science Vol. 76; no. 1; pp. 123 - 127
Main Authors:	NISHIMURA, Maki, TOYOTA, Yumi, ISHIDA, Yoshikazu, NAKAYA, Hideki, KAMEYAMA, Kyohko, NISHIKAWA, Yoshifumi, MIYAHARA, Kazuro, INOKUMA, Hisashi, FURUOKA, Hidefumi
Format:	Journal Article
Language:	English
Published:	Japan JAPANESE SOCIETY OF VETERINARY SCIENCE 01-01-2014 Japan Science and Technology Agency The Japanese Society of Veterinary Science
Subjects:	Animals Cattle Cattle Diseases - microbiology Cattle Diseases - pathology Cattle Diseases - surgery DNA, Fungal - chemistry DNA, Fungal - genetics Fatal Outcome Immunohistochemistry - veterinary Lymphadenitis - microbiology Lymphadenitis - pathology Lymphadenitis - surgery Lymphadenitis - veterinary Male necrotic lymphadenitis Pathology Polymerase Chain Reaction - veterinary ruminal tympany zygomycosis Zygomycosis - microbiology Zygomycosis - pathology Zygomycosis - surgery Zygomycosis - veterinary
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Summary:	A 9-month-old steer was autopsied due to recurrent ruminal tympany. A macroscopic examination found an enlarged caudal mediastinal lymph node, and a section of the lymph node revealed necrosis with marked calcification, similar to tuberculous lymphadenitis. Histopathologically, the lesion consisted of multiple coagulative necrotic foci and fibrosis with macrophage, lymphocyte, eosinophil and multinucleated giant cell infiltration. Non-uniform width hyphae were detected in the necrotic area and within the cytoplasm of the multinucleated giant cells, and they were found to be anti-Rhizopus arrhizus antibody positive in an immunohistochemical examination. Therefore, the steer was diagnosed with necrotic caudal mediastinal lymphadenitis due to zygomycetes infection, and inhibition of eructation by the enlarged lymph node was the likely cause of the ruminal tympany.
Bibliography:	ObjectType-Case Study-2 SourceType-Scholarly Journals-1 ObjectType-Feature-4 content type line 23 ObjectType-Report-1 ObjectType-Article-3
ISSN:	0916-7250 1347-7439
DOI:	10.1292/jvms.13-0084