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Related Experiment Video

Updated: Jun 19, 2026

Surgical Technique for the Implantation of a Biomimetic Artificial Intervertebral Disc in a Goat Animal Model

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Published on: October 10, 2025

Possible parachordoma in a dog.

S F Forsyth¹, K G Thompson, A F French

¹Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand. s.f.forsyth@massey.ac.nz

New Zealand Veterinary Journal

|October 6, 2009

Summary

This study reports the first suspected canine parachordoma, a benign tumor in a Flat-Coated Retriever. The mass showed unusual cytology but did not recur after surgical removal.

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Area of Science:

Veterinary Pathology
Canine Oncology
Comparative Pathology

Background:

Parachordomas are rare tumors typically found in humans.
This case explores a potential canine counterpart.

Observation:

A 15-mm mass was identified in the subcutaneous tissue of a 6.5-year-old Flat-Coated Retriever.
Cytology revealed large polygonal cells with prominent nucleoli and intracytoplasmic vacuoles.
Histology showed similar cells within fibrous connective tissue.

Findings:

Immunohistochemistry demonstrated positivity for vimentin and cytokeratin (AE1/AE3).
The tumor cells were negative for desmin and glial fibrillary acidic protein (GFAP).
Clinical, gross, histological, and immunohistochemical features resemble human parachordomas.

Implications:

This case represents the first suspected parachordoma in a dog.
The tumor, though cytologically malignant-appearing, proved benign with no recurrence or metastasis after 18 months.
Highlights the importance of immunohistochemistry in diagnosing rare canine neoplasms.