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J Neuroradiol ; 32(1): 59-62, 2005 Jan.
Artículo en Francés | MEDLINE | ID: mdl-15798616

RESUMEN

A case of primary meningeal intermediate grade melanocytic neoplasm involving the right C2 nerve root is presented. MRI findings may suggest this rare entity, especially when an extra-axial lesion is located in the posterior fossa or cervical spinal canal and demonstrates shortening of both T1 and T2. Eventually, definitive diagnosis relies on histology which demonstrates spindle-shaped melanocytic cells that are Fontana stained and positive for HMB:45 antigen. Cellularity, pleomorphism, mitotic rate, proliferation index and invasiveness are useful criteria to distinguish among the spectrum of primary melanocytic tumors of the central nervous system ranging from melanocytoma to malignant melanoma.


Asunto(s)
Melanoma/diagnóstico , Neoplasias Meníngeas/diagnóstico , Adulto , Diagnóstico Diferencial , Femenino , Humanos , Imagen por Resonancia Magnética , Melanoma/patología , Neoplasias Meníngeas/patología , Tomografía Computarizada por Rayos X
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