Primary melanocytic neoplasm [Neurosurgery Wiki]

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=====Primary melanocytic neoplasm=====
Primary melanocytic neoplasms of the CNS belong to the tumors of the meninges, further classified as diffuse melanocytosis, [[melanocytoma]], [[malignant melanoma]], and [[meningeal melanocytoma]]. 

A primary CNS melanoma can be diagnosed after a positive cerebral biopsy, even if extensive dermatological, mucosal and ophthalmological examinations were inconclusive
((Hayward RD. Malignant melanoma and the central nervous system. A guide for
classification based on the clinical findings. J Neurol Neurosurg Psychiatry.
1976 Jun;39(6):526-30. PubMed PMID: 950562; PubMed Central PMCID: PMC492341.
)).

Intracranial malignant melanomas demonstrate a moderate to high intensity in T1WI and a low intensity in T2WI, while [[amelanotic melanoma]]s demonstrate a low intensity in T1WI and a high intensity in T2WI 
((Isiklar I, Leeds NE, Fuller GN, et al. Intracranial metastatic melanoma: correlation between MR imaging characteristics and melanin content. Am J Roentgenol. 1995;165:1503–12.))
((Vanzieleghem BD, Lemmerling MM, Van Coster RN. Neurocutaneous melanosis presenting with intracranial amelanotic melanoma. Am J Neuroradiol. 1999;20:457–60.)).