A 25-year-old female macaroni penguin (Eudyptes chrysolophus) was diagnosed with exophthalmos secondary to retrobulbar neoplasia through use of computed tomography (CT). Histopathologic examination of the mass supported a diagnosis of malignant round cell neoplasia. Immunohistochemical (IHC) labeling was applied to determine cell origin; the neoplastic cells did not label with T-cell marker CD3 or B-cell marker BLA.36 and could not be further characterized. The scleral ossicles precluded evaluation of the retrobulbar space by ultrasonography; therefore, CT scanning is recommended for examination of intraorbital structures in penguin and other avian species.
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1 March 2015
Diagnosis of Retrobulbar Round Cell Neoplasia in a Macaroni Penguin ( Eudyptes chrysolophus) Through Use of Computed Tomography
Sarah J. Woodhouse,
Michelle Rose,
Danielle R. Desjardins,
Dipl ACVP,
Dalen W. Agnew
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Avian
computed tomography
Eudyptes chrysolophus
exophthalmos
immunohistochemistry
macaroni penguin
retrobulbar mass