Mohammad Molazem - Department of Radiology and Surgery, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran.
Mohammad Reza Esmaili-Nejad - Department of Radiology and Surgery, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran.
Roshanak Mokhtari - Department of Radiology and Surgery, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran.
Rana Vafaei - Department of Internal Medicine, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran.
Solmaz Chegini - Department of Internal Medicine, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran.

Case Description- A ۱۳ 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 ۹ 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 ۶ 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).

Haemangiopericytoma, CT-Scan angiography, Ultrasonography