《英文msh詞典》Pilocytic Astrocytomas
[入口詞] Pilocytic Astrocytomas
[主題詞] Astrocytoma
[英文釋義] Neoplasms of the brain and spinal cord derived from glial cells which vary from histologically benign forms to highly anaplastic and malignant tumors. Fibrillary astrocytomas are the most common type and may be classified in order of increasing malignancy (grades I through IV). In the first two decades of life,astrocytomas tend to originate in the cerebellar hemispheres; in adults,they most frequently arise in the cerebrum and frequently undergo malignant transformation. (From Devita et al.,Cancer: Principles and Practice of Oncology,5th ed,pp2013-7; Holland et al.,Cancer Medicine,3d ed,p1082)