JUVENILE PILOCYTIC ASTROCYTOMA
\d͡ʒˈuːvənˌa͡ɪl pˌa͡ɪləsˈɪtɪk ˌastɹəsɪtˈə͡ʊmə], \dʒˈuːvənˌaɪl pˌaɪləsˈɪtɪk ˌastɹəsɪtˈəʊmə], \dʒ_ˈuː_v_ə_n_ˌaɪ_l p_ˌaɪ_l_ə_s_ˈɪ_t_ɪ_k ˌa_s_t_ɹ_ə_s_ɪ_t_ˈəʊ_m_ə]\
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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)
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