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Clinical photograph of a cat with an injection site sarcoma in a typical intrascapular location. These tumors develop in some cats (1–16 cases/10,000 vaccinations) due to chronic inflammation following administration of adjuvanted vaccines, inactivated rabies vaccines, long-acting corticosteroid injections, or other injections. The chronic inflammation causes neoplastic transformation of fibroblasts.
Courtesy of Dr. Alice Villalobos.