Diagnostic Imaging Features of Haemangiopericytoma at Presumed Location of Vaccine-Site in a Dog: A Report of a 13 Years Old Spitz

Case Description- A 13 years old neutered female spitz dog was presented to the Small Animal Veterinary Teaching Hospital, University of Tehran for appearance of a soft tissue mass in the interscapular region in about 9 months ago with a progressive increase in the size of the mass.Clinical Finding- The mass was solid, cold and non-painful in physical examination. Radiography, Computed tomography angiography and ultrasonography were performed for evaluation of the volume and angiogenesis of the mass.Treatment and Outcome- Treatment was consist of surgical excision of the mass. The patient was fine up to 6 months after surgery, then recurrence at the same site was observed, therefore the owner requested for euthanasia.Clinical Relevance- In this record, we presented diagnostic imaging characteristics of a mass presumed at the injection site in a dog. Few records have been published in veterinary literature about injection site tumors in dogs, however, there are plenty of those in relation with feline injection-site sarcoma (FISS).