Primary Meningeal Melanocytoma Located in Foramen Magnum： a Case Report and Review of the Literatures

LIMAS and Tio1 proposed the term meningeal melanocytoma first time in 1972 to describe a primary melanotic tumor of the leptomeninges with prolonged clinical course and benign his-tology. Meningeal melanocytoma of the central nervous system is rare and benign primary meningeal melanocy- toma （PMM） is more exceptional, and also less usual than the malignant types.2 This rare tumor falls under the sub- classification of primary melanocytic lesions in the World Health Organization＇s classification of central nervous sys- tem tumors.3 PMM located in the foramen magnum region is an unusual cause of bulbus medullae and fourth ventricle Compression. Here we report a 48-year-old man with a PMM which is located in the foramen magnum inducing supratentorial obstructive hydrocephalus.