MESENCEPHALIC NEOPLASMS
\mˌɛsənsɪfˈalɪk nˈiːə͡ʊplˌazəmz], \mˌɛsənsɪfˈalɪk nˈiːəʊplˌazəmz], \m_ˌɛ_s_ə_n_s_ɪ_f_ˈa_l_ɪ_k n_ˈiː__əʊ_p_l_ˌa_z_ə_m_z]\
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Benign and malignant intra-axial tumors of the MESENCEPHALON; PONS; or MEDULLA OBLONGATA of the BRAIN STEM. Primary and metastatic neoplasms may occur in this location. Clinical features include ATAXIA, cranial neuropathies (see CRANIAL NERVE DISEASES), NAUSEA, hemiparesis (see HEMIPLEGIA), and quadriparesis. Primary brain stem neoplasms are more frequent in children. Histologic subtypes include GLIOMA; HEMANGIOBLASTOMA; GANGLIOGLIOMA; and EPENDYMOMA.
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