Abstract
A male Japanese Tosa Dog 7years old with large spleen hematoma was rescued successfully from bad prognosis by surgical removal. Before clinical observation and surgery, this case was diagnosed as sever canine filariasis. After the removal of hematoma with the spleen, the clinical findings of the dog were improved day by day. Body weight was 38.0 kg soon after the operation, but increased to 53.0kg 232days after the operation. No symptoms caused by lack of the spleen appeared. The spleen hematoma removed by the operation was about 31cm in diameter and weighed 9.05kg. From the histopathological findings, it seems that this hematoma may have been formed by rupture of some affected blood vessels in reticuloendotheliosis-like changes of the spleen, but not a traumatic cause.
