Polycythemia, emperipolesis and extramedullary haematopoiesis caused by acute shock: the first record in the Northern white-breasted hedgehog Erinaceus roumanicus Barrett-Hamilton, 1900

An adult female hedgehog Erinaceus roumanicus, was found in a city traffic zone with serious injuries, most likely from a vehicle impact. Rapid diagnostics, including X-ray imaging, were performed at the veterinarian clinic to rescue the animal. Due to multiple traumatic injuries and poor prognosis, the animal was anesthetized for blood sampling and then euthanized. Polycythaemia, platelet aggregation, rare megakaryoblasts, neutrophilia, lymphocytosis, and a high red blood cell (RBC) and white blood cell (WBC) count were found in peripheral blood. Eosinophilia and the physiological phenomenon of emperipolesis were detected in the femur bone marrow, while the liver biopsy confirmed the extramedullary haematopoiesis (EMH). It has been noted that acute hypovolemic shock results in rapid changes in haematological and biochemical parameters. Given the increased vulnerability of small mammal fauna due to expanding urbanization, this finding may significantly improve care for their welfare and conservation.