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The Other End of the Leash: An Experimental Test to Analyze How Owners Interact with Their Pet Dogs

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Published on: October 13, 2017

Encephalic fibrosarcoma in a dog.

Megan J Crawford¹, Elena A Demeter², Anibal G Armién³

¹Department of Pathology, College of Veterinary Medicine, University of Georgia, Athens, GA, USA.

Journal of Veterinary Diagnostic Investigation : Official Publication of the American Association of Veterinary Laboratory Diagnosticians, Inc

|January 21, 2026

Summary

This summary is machine-generated.

This study reports a rare canine intracranial fibrosarcoma in a dog

Keywords:

dogs fibrosarcoma intracranial sarcoma neuropathology

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Area of Science:

Veterinary Pathology
Canine Oncology
Neuro-oncology

Background:

Intracranial sarcomas are uncommon in dogs.
This case details a fibrosarcoma affecting the pons.

Purpose of the Study:

To describe a rare case of canine intracranial fibrosarcoma.
To characterize the histological, immunohistochemical, and ultrastructural features of the tumor.

Main Methods:

Histopathological examination of a brain mass.
Immunohistochemistry for vimentin, myoglobin, desmin, and myogenin.
Transmission electron microscopy (TEM) for ultrastructural analysis.

Main Results:

A 1.5-cm mass in the pons consistent with fibrosarcoma.
Neoplastic cells showed vimentin positivity, with weaker staining for desmin and myoglobin.
TEM revealed neoplastic cells with collagenous stroma, but myogenic differentiation was not confirmed.

Conclusions:

The findings support a diagnosis of encephalic fibrosarcoma in this dog.
Immunohistochemistry suggested myogenic differentiation, though TEM did not confirm it.
This case contributes to the understanding of rare brain tumors in canines.