Microchip-associated fibrosarcoma in a cat

Vet Dermatol. 2011 Dec;22(6):565-9. doi: 10.1111/j.1365-3164.2011.00975.x. Epub 2011 May 2.


A 9-year-old, neutered male cat was presented for a subcutaneous mass on the neck. After surgical removal of the mass, a pet identification microchip was found within the tumour. Histological examination of the mass revealed typical features of the feline postinjection sarcoma. The cat had never received injections at the tumour site; all routine vaccinations were administered in the hindlimbs. Few cases of sarcomas developing at the site of microchip application have been reported in animals, although the contributory role of vaccine administrations has not been ruled out. This is the first report of a microchip-associated fibrosarcoma in a cat. Adherence to American Association of Feline Practitioners vaccination guidelines, avoiding the interscapular area, enabled confirmation of the definitive aetiology of the neoplasia.

Publication types

  • Case Reports

MeSH terms

  • Animal Identification Systems / instrumentation
  • Animal Identification Systems / veterinary*
  • Animals
  • Cat Diseases / diagnosis
  • Cat Diseases / etiology*
  • Cats
  • Fibrosarcoma / diagnosis
  • Fibrosarcoma / etiology
  • Fibrosarcoma / veterinary*
  • Head and Neck Neoplasms / diagnosis
  • Head and Neck Neoplasms / etiology
  • Head and Neck Neoplasms / veterinary*
  • Male
  • Prostheses and Implants / adverse effects
  • Prostheses and Implants / veterinary*