Abstract
AbstractA 10‐month‐old male king penguin (Aptenodytes patagonicus) presented with an acute episode of collapse. Complete blood count and serum biochemistry revealed a severe lymphocytic leukocytosis (white blood cell count 122.76 × 103/µl; lymphocytes 117.8 × 103/µl), elevated creatinine kinase (1414 IU/L) and mild anaemia (packed cell volume 33%). Marked hepatomegaly was noted on radiographs of the coelom. Blood smears contained an extremely high number of lymphocytes with frequent bizarre forms and a high mitotic count. Despite good initial response to treatment with steroids and prophylactic antimicrobials, the bird's lymphocytic leukocytosis increased, and the animal spontaneously died 2 weeks after initial presentation. Postmortem examination revealed infiltration of multiple organs, including bone marrow, with neoplastic lymphocytes consistent with T‐cell phenotype.
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