Tumors of the spleen often occur in middle-aged dogs and can range from benign to malignant. Maltese, a 13-year-old neutered dog, visited the hospital with several vomiting and loss of appetite that lasted intermittently for about 2 months. There was no problem with the dog's consciousness, walking was normal, and mandibular and popliteal lymph nodes were normal in size and no abnormality was observed. Ultrasonography revealed a mass in the spleen, and the spleen was removed through splenomegaly. Histological examination concluded that the spleen was a hematoma. The hematoma is 6 × 6 × 6 cm in size, and histologically, it is not encapsulated inside the spleen parenchyma, but a nodule with clear borders is formed. The inside of the nodule is mostly composed of red blood cells, dilated blood vessels, and macrophages containing hemoglobin. It is identified as a hematoma originating inside the spleen.
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