[Meningeal melanocytoma].
The authors report on a case of melanocytoma surgically removed from the craniocervical meninges of a 59-year-old man. Although the excision had been incomplete, the patient showed a disease-free course extending well over ten years. On histology, the tumor consisted of moderately cellular arrays of spindle-shaped melanocytes with a vaguely angiocentric whorling tendency, and without evidence of infiltrative growth. Electron microscopy identified tumor cells as ones bearing dendritic processes with complex melanosomes. The latter showed histochemical properties of melanosomal melanin, as well as immunoreactivity for the melanosome-associated markers HMB-45, and MELAN-A. Hallmarks of meningial differentiation were, at the same time, absent. The MIB-1 proliferation rate of the lesion, as assessed in a simultaneous testing of a panel including primary and metastatic central nervous system melanomas, as well as a uveal melanoma remained inferior to 1.5 percent. The data presented and a critical review of the literature suggest that meningeal melanocytoma is a mostly benign nevus-like lesion of neural crest cells with a very limited, although not discountable, margin for aggressive growth.
Szegedi Tudományegyetem, Altalános Orvostudományi Kar, Szent-Györgyi Albert Orvos- és Gyógyszerésztudományi Centrum, Patológiai Intézet.
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Vajtai
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Hódi
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Bozóky
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Varga
D000368:Aged; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D008545:Melanoma / Q000175:diagnosis* / Q000473:pathology; D008577:Meningeal Neoplasms / Q000175:diagnosis* / Q000473:pathology; D008875:Middle Aged; D018329:Nevus, Blue / Q000175:diagnosis; D011379:Prognosis; D012878:Skin Neoplasms / Q000175:diagnosis