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Meningioma of the scalp. Light and electron microscopic observations
Abstract:
Meningiomas occurring in the skin are rare and may be difficult to recognize on frozen section. We found intraoperative cytologic smears helpful in identifying the characteristically bland nuclei, cellular whorls, and psammoma bodies that are typical of the light microscopy of meningiomas in the CNS. This case (a scalp lesion) was also examined ultrastructurally. Cutaneous meningiomas are histologically and ultrastructurally identical to their meningeal counterparts and must be approached with caution surgically.
Insights
Cutaneous meningiomas, rare skin tumors, can be challenging to diagnose during surgery. Intraoperative cytology aids in identifying these tumors by revealing characteristic features similar to central nervous system meningiomas.
Area of Science:
- Neuropathology
- Dermatopathology
- Surgical Pathology
Background:
- Meningiomas are tumors arising from the meninges, the membranes surrounding the brain and spinal cord.
- Cutaneous meningiomas are rare neoplasms presenting in the skin, often mimicking other cutaneous lesions.
- Accurate intraoperative diagnosis is crucial for appropriate surgical management.
Observation:
- This study examined a case of cutaneous meningioma on the scalp.
- Intraoperative cytologic smears were utilized for rapid assessment.
- Histologic and ultrastructural examination were performed for detailed characterization.
Findings:
- Cytologic smears revealed characteristic features of meningioma, including bland nuclei, cellular whorls, and psammoma bodies.
- These cytologic findings were consistent with light microscopy of central nervous system (CNS) meningiomas.
- Histologic and ultrastructural analyses confirmed that cutaneous meningiomas are identical to their meningeal counterparts.
Implications:
- Intraoperative cytology can be a valuable tool for the diagnosis of cutaneous meningiomas, especially on frozen section.
- Recognizing the characteristic features of meningiomas in cutaneous lesions is essential for surgeons.
- These tumors require careful surgical consideration due to their potential for recurrence and similarity to CNS meningiomas.