A case of ischaemic strangulation of the small intestine caused by a haemangiopericytoma in a 12-year-old horse is reported. An encapsulated, 4-cm diameter mass was located in the mesentery adjacent to the wall of the ileum resulting in an ileal obstruction and a subsequent small intestinal volvulus. Surgical management of the case was performed and the horse was discharged from the hospital with no further complications and no recurrence during a 2-year follow-up period. After histopathological and immunohistochemical evaluation, the mass was characterised as a haemangiopericytoma. The only report of a haemangiopericytoma in a horse describes a mass located in the eyelid. In humans and dogs, haemangiopericytomas can be malignant with local recurrences after excision and metastasis. In our case, the tumour caused severe ileal obstruction, but no distant metastases were found, and there were no clinical signs of recurrence for a 2-year follow-up period after surgery.
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