Successful Treatment of Vertebral Osteosarcoma in a Cat Using Marginal Surgical Excision and Chemotherapy

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Original languageEnglish
Article number315
Journal / PublicationVeterinary Sciences
Issue number7
Online published23 Jun 2022
Publication statusPublished - Jul 2022



A three-year-old male neutered Norwegian Forest cat was referred for bilateral ambula-tory paraparesis and spinal pain. On magnetic resonance imaging (MRI), a mass involving the right epaxial muscles with vertebral canal invasion and causing marked extradural spinal cord compres-sion was identified. At surgery, the mass was debulked and a right hemilaminectomy was per-formed. Histopathology was diagnostic of fibroblastic osteosarcoma. Residual osteolytic lesions of the osteosarcoma were present at the level of the spinous process of the second lumbar vertebra. Four cycles of adjuvant doxorubicin chemotherapy were administered followed by oral toceranib phosphate. Neurological signs improved gradually over weeks to months and the lesion in the spinous process was no longer visible on radiographs. At one year from diagnosis, an MRI of the T3-L3 (3rd thoracic vertebra to the 3rd lumbar vertebra) spinal region and a whole-body computer tomography (CT) scan found no evidence of the osteosarcoma in the spine or of any metastasis. All medications were stopped and, at the time of writing 16 months later, the patient is neurologically normal with no signs of cancer recurrence. This is the first case report documenting the complete resolution of vertebral osteosarcoma lesions after treatment with doxorubicin followed by toceranib phosphate. The treatment also prevented tumor recurrence and was associated with an exception-ally long-term survival time.

Research Area(s)

  • axial osteosarcoma, cats, feline, toceranib phosphate

Bibliographic Note

Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.

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