Acute myelomonocytic leukemia negative for alpha-naphthyl acetate esterase stain in a Holstein cow |
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| Authors: | Masaki MAEZAWA Ai NAKAMICHI Nao AKIYAMA Michihito TAGAWA Ken-ichi WATANABE Yoshiyasu KOBAYASHI Hisashi INOKUMA |
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| Institution: | 1)Veterinary Medical Center, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan;2)Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Inada, Obihiro, Hokkaido 080-8555, Japan |
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| Abstract: | A 4-year, 7-month-old Holstein cow presented with anorexia. Physical examination revealed masses in the interscapular region and vagina. Blast cells were detected in the masses and peripheral blood by fine needle aspiration cytology and hematological examination. By bone marrow aspiration, blast cells constituted up to 24.2% of all nucleated cells, and 22% and 2% of non-erythroid cells stained positive for myeloperoxidase and alpha-naphthyl acetate esterase (ANAE), respectively. Pathological examination revealed the mass lesions consisted of a proliferation of tumor cells, which were positive for monocytic markers (HLA-DR and Iba-1). The cow was diagnosed with acute myelomonocytic leukemia (AMML). Even when tumor cells are ANAE-negative, AMML cannot be completely ruled out and should be considered when diagnosing cattle with leukemia/lymphoma. |
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| Keywords: | acute myelomonocytic leukemia alpha-naphthyl acetate esterase cow cytochemical staining diagnosis |
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