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

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. 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 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. 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).