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| A 5-year old, 258-kg-weight, mixed thoroughbred gelding was found acute death with abdominal enlargement caused by hemorrhagic strangulated enteritis and colic. Necropsy and histopathology revealed multicentric lymphoma involving spleen and abdominal lymph nodes, disseminated atherosclerosis of vena cava, aorta and myocardium and metastatic calcification. Immunohistochemistry was performed in order to categorize immunophenotype of T-cell and B-cell lymphoma. This case was diagnosed as multicentric low grade B-cell lymphoma. In addition, pathogenesis of lymphoma associated with disseminated atherosclerosis of this case was discussed.