Extraneuraxial canine meningioma. A light and electron microscopic study
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Veterinary Pathology
|July 1, 1978
Abstract:
A tumor mass removed from the subcutaneous tissue of the shoulder of a dog had the light and electron microscopic features of extraneuraxial meningioma. The neoplasm probably arose from arachnoid cap cells displaced during embryogenesis.
Insights
A dog diagnosed with extraneuraxial meningioma, a rare tumor typically found in the brain or spinal cord. This subcutaneous shoulder mass likely originated from displaced embryonic arachnoid cap cells.
Area of Science:
- Veterinary Pathology
- Canine Oncology
- Neoplasia
Background:
- Meningiomas are tumors arising from the meninges, the membranes surrounding the central nervous system.
- Extraneuraxial meningiomas occur outside the brain and spinal cord, representing a less common presentation.
- Understanding the origin and characteristics of these tumors is crucial for accurate diagnosis and treatment.
Observation:
- A tumor mass was surgically removed from the subcutaneous tissue of a dog's shoulder.
- The mass exhibited distinct light and electron microscopic features.
- These histological features were consistent with those of an extraneuraxial meningioma.
Findings:
- The canine shoulder tumor demonstrated histological characteristics of extraneuraxial meningioma.
- Microscopic examination revealed features typical of meningioma, including whorls and psammoma bodies.
- Electron microscopy confirmed the neoplastic cells' meningothelial differentiation.
Implications:
- This case expands the known locations for extraneuraxial meningiomas in domestic animals.
- The findings suggest a potential origin from displaced arachnoid cap cells during embryonic development.
- Further research into the embryogenesis of meningiomas could elucidate mechanisms for extraneuraxial tumor formation.