Table 1 Summary of the Who Ii classification of CNS tumors

Major Categories

Examples

I. Neuroepithelial origin

A. Astrocytic tumors

B. Oligodendroglial origin

C. Ependymomas

D.Mixed gliomas

E. Choroid plexus tumors

F. Tumors of uncertain origin

G.Neuronal tumors

H.Pineal tumors

I. Embryonal tumors

II. Tumors of cranial and spinal nerves

A. Schwannoma

B. Neurofibroma

C. Malignant nerve sheath tumor

III. Tumors of the meninges

A. Tumors of meningothelial cells

B. Mesenchymal tumors

C. Primary melanocytic tumors

D.Tumors of uncertain origin

IV. Hemopoietic neoplasms

V. Germ cell tumors

VI. Cysts and tumor-like lesions glioblastoma multiforme oligodendroglioma ependymoma, subependymoma mixed oligoastrocytoma choroid plexus papilloma and carcinoma astroblastoma gangliocytoma, ganglioglioma pineocytoma, pineoblastoma

PNET 1 (medulloblastoma), retinoblastoma schwannoma solitary neurofibroma, plexiform type neurogenic sarcoma meningioma, malignant meningioma lipoma, rhabdomyosarcoma melanocytoma, malignant melanoma hemangiopericytoma, capillary hemangioblastoma lymphoma, plasmacytoma germinoma, choriocarcinoma, teratoma

Rathke's cleft cyst, epidermoid and dermoid tumors, colloid cysts

VII. Tumors of the anterior pituitary pituitary adenoma and carcinoma

VIII. Local extensions from regional craniopharyngioma, chordoma, chondroma, tumors chondrosarcoma

IX. Metastatic tumors various origins

Primitive neuroectodermal tumor

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