HYDRANENCEPHALIES
\hˈa͡ɪdɹe͡ɪnnsˌɛfaliz], \hˈaɪdɹeɪnnsˌɛfaliz], \h_ˈaɪ_d_ɹ_eɪ_n_n_s_ˌɛ_f_a_l_i_z]\
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A congenital condition where the greater portions of the cerebral hemispheres and CORPUS STRIATUM are replaced by CSF and glial tissue. The meninges and the skull are well formed, which is consistent with earlier normal embryogenesis of the telencephalon. Bilateral occlusions of the internal carotid arteries in utero is a potential mechanism. Clinical features include intact brainstem reflexes without evidence of higher cortical activity. (Menkes, Textbook of Child Neurology, 5th ed, p307)
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