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Diseases of Aquatic Organisms

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DAO 134:57-64 (2019)  -  DOI: https://doi.org/10.3354/dao03358

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Epidemic nodular facial myxomatous dermatitis in juvenile Cranwell’s horned frogs Ceratophrys cranwelli

Kenichi Tamukai1, Junichi Sugiyama2, Yuta Nagata2, Omatsu Tsutomu3, Yukie Katayama3, Tetsuya Mizutani3, Masanobu Kimura4, Yumi Une5,*

1Den-en-chofu Animal Hospital, 2-1-3 Denenchofu, Ota-ku, Tokyo 145-0071, Japan
2Laboratory of Veterinary Pathology, Azabu University,1-17-71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5201, Japan
3Research and Education Center for Global Infectious Diseases of Animals, Tokyo University of Agriculture and Technology, 3-5-8 Fuchu, Tokyo 183-8507, Japan
4Department of Veterinary Science, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
5Laboratory of Veterinary Pathology, Okayama University of Science, 1-3 Ikoino-oka, Imabari, Ehime 794-8555, Japan
*Corresponding author:

ABSTRACT: In 2017, approximately 40 out of 100 captive Cranwell’s horned frogs Ceratophrys cranwelli from several facilities in Japan exhibited protruding facial lesions. Histopathological examination was performed on 6 specimens with such lesions randomly selected from 2 facilities. Lesions consisted of scattered stellate to spindle-shaped cells without atypia in an abundant myxoid matrix and occasional lymphocytic infiltrates. Maxillary bone was resorbed. No etiological organisms were detected using light microscopy or metagenomic analysis of the lesions. Macroscopic and histological assessments indicate that the lesions are associated with nodular facial myxomatous dermatitis, which has never been reported in amphibians.


KEY WORDS: Myxomatous · Facial lesions · Pacman frog · Ceratophryidae · Morphological


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Cite this article as: Tamukai K, Sugiyama J, Nagata Y, Tsutomu O and others (2019) Epidemic nodular facial myxomatous dermatitis in juvenile Cranwell’s horned frogs Ceratophrys cranwelli. Dis Aquat Org 134:57-64. https://doi.org/10.3354/dao03358

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