A Case of Massive Splenic Hematoma in a Geriatric Dog

A 10-year-old intact female, mixed breed dog presented with abdominal distention of 2 months duration and three days of decreased appetite. The patient was conscious and no other gross abnormalities were noted. A tentative diagnosis of idiopathic massive hematoma or hemangiosarcoma was made on evaluating all clinical findings. Splenectomy was performed for treatment of abdominal distention and histopathological investigation was initiated to confirm the diagnosis. The hematoma was extremely massive on gross morphology, with the size of 20.2 × 12.4 cm and the splenic mass was diagnosed as hematoma formation, with moderate to marked lymphoid hyperplasia and adjacent moderate extramedullary hematopoiesis, based on microscopic description of spleen histology. This is the first case report in veterinary literature of a dog with extremely rare splenomegaly, an unusually large hematoma, with no malignancy or remarkable clinical signs.