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Diseases of Aquatic Organisms

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DAO 134:209-213 (2019)  -  DOI: https://doi.org/10.3354/dao03372

NOTE
Osteochondromatosis (multiple cartilaginous exostoses) in an immature killer whale Orcinus orca

Maíra Laeta1,2,3,*, Erwin J. O. Kompanje4, Alastair Watson5, Sheila M. F. M. Souza6, Katharina Dittmar7, Sandra C. Cuenca8,9, Lucas B. Hassel10, Salvatore Siciliano3,11

1Programa de Pós-graduação em Biodiversidade e Biologia Evolutiva, Universidade Federal do Rio de Janeiro (UFRJ), Cidade Universitária, Rio de Janeiro, RJ 21941-902, Brazil
2Setor de Mastozoologia, Departamento de Vertebrados, Museu Nacional da Universidade Federal do Rio de Janeiro (MN/UFRJ), São Cristóvão, Rio de Janeiro, RJ 20940-040, Brazil
3Grupo de Estudos de Mamíferos Marinhos da Região dos Lagos (GEMM-Lagos)), Rua São José, 1.260, Praia Seca, Araruama 28970-000, Brazil
4Natural History Museum Rotterdam, Westzeedijk 345, 3015AA Rotterdam, Netherlands
535 Torquay Place, Bryndwr, Christchurch 8053, New Zealand
6Departamento de Endemias Samuel Pessoa, Escola Nacional de Saúde Pública Sergio Arouca, Fundação Oswaldo Cruz, Rio de Janeiro, RJ 21040-900, Brazil
7Department of Integrative Biology, 401 WIDB, Brigham Young University, Provo, UT 84602, USA
8Centro Universitário Monte Serrat (UNIMONTE), Rua Comendador Martins, 52, Santos, SP 11015-530 Brazil
9Universidade Metodista de São Paulo (UMESP), Rua Alfeu Tavares, 112, São Bernardo do Campo, SP 09641-000 Brazil
10Shell Brasil Petróleo Ltda, Barra da Tijuca, Rio de Janeiro, RJ 22640-102, Brazil
11Laboratório de Enterobactérias, Instituto Oswaldo Cruz/Fiocruz, Pav. Rocha Lima, 3º. Andar, Av. Brasil 4.365, Manguinhos, Rio de Janeiro, RJ 21041-210, Brazil
*Corresponding author:

ABSTRACT: An immature killer whale Orcinus orca found dead on the southeastern Brazilian coast had multiple bone proliferations: on the skull, vertebrae, hemal arches, and ribs. The bony formations were characterized as multiple osteochondromas, as defined by osteochondromatosis. The diagnosis was based on macroscopic and radiographic observations. These benign osseocartilaginous tumors affect young individuals and grow until skeletal maturity is achieved. Case reports of this condition, besides humans, include other mammals, with most reports for pets and domestic mammals such as cattle, and a report in a fossil canid (Hesperocyon) from the Oligocene. The etiology, diagnosis, developmental characteristics, and occurrence of osteochondromas are distinct among different species. This report describes the first case of multiple osteochondromas in a wild cetacean.


KEY WORDS: Osteochondroma · Osteochondromatosis · Benign tumors · Endochondral ossification · Killer whale · Cetacea


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Cite this article as: Laeta M, Kompanje EJO, Watson A, Souza SMFM and others (2019) Osteochondromatosis (multiple cartilaginous exostoses) in an immature killer whale Orcinus orca. Dis Aquat Org 134:209-213. https://doi.org/10.3354/dao03372

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