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Here, we report a case of spontaneous granulocytic leukemia in a 51-week-old male NOD/Shi- scid IL-2R γ  null (NOG) mouse. The mouse showed progressive anemia and rough respiratory movement. Macroscopically, the spleen was discolored and enlarged. Histologically, the bone marrow of the sternum and femur was highly cellular and almost exclusively filled with neoplastic cells. The nuclei of neoplastic cells were large, oval to slightly irregular in shape, and a small number of cells had kidney- or ring-shaped nuclei. Neoplastic cells extensively infiltrated the organs, and the spleen and liver were prominently involved. Immunohistochemically, a large population of neoplastic cells in the red pulp of the spleen and sinusoid of the liver was positive for myeloperoxidase. Based on the histological features, this case was diagnosed with granulocytic leukemia. This novel information on spontaneous tumors may be helpful for the appropriate use of this mouse strain in further research.

Spontaneous granulocytic leukemia in a NOD/Shi-scid IL-2Rγnull mouse

Spontaneous granulocytic leukemia in a NOD/Shi-scid IL-2Rγ^null mouse