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[Meningeal melanocytoma]
1Szegedi Tudományegyetem, Altalános Orvostudományi Kar, Szent-Györgyi Albert Orvos- és Gyógyszerésztudományi Centrum, Patológiai Intézet.
Orvosi Hetilap
|March 27, 2001
Summary
Meningeal melanocytoma, a rare tumor of neural crest cells, can be largely benign. This case study shows a patient remained disease-free for over ten years after incomplete surgical removal.
Area of Science:
- Neuro-oncology
- Dermatopathology
- Surgical Pathology
Background:
- Meningeal melanocytomas are rare neoplasms arising from the meninges.
- Understanding their biological behavior and prognostic indicators is crucial for patient management.
Observation:
- A 59-year-old male presented with a surgically removed craniocervical melanocytoma.
- Histological examination revealed spindle-shaped melanocytes without infiltrative growth.
- Electron microscopy confirmed tumor cells with melanosomes and positive immunoreactivity for HMB-45 and MELAN-A.
Findings:
- Despite incomplete excision, the patient experienced a disease-free survival exceeding ten years.
- The MIB-1 proliferation rate was low (<1.5%), similar to benign melanocytic lesions.
- The tumor lacked features of meningeal differentiation.
Implications:
- Meningeal melanocytoma behaves as a predominantly benign, nevus-like lesion.
- While generally indolent, a small potential for aggressive growth exists.
- This case highlights the favorable long-term prognosis even with incomplete resection.