Historically, brainstem gliomas (BSGs) were regarded as a homogeneous category of central nervous system (CNS) neoplasms with a uniformly poor prognosis. With the advent of magnetic resonance imaging (MRI), BSGs are now recognized as a heterogeneous group of neoplasms with distinct subtypes that vary widely with respect to prognosis and growth patterns. They can be classified broadly into two categories: the diffuse intrinsic gliomas and the nondiffuse brainstem tumors (Table 3.1). The diffuse intrinsic gliomas, which constitute the majority of brainstem tumors and conform to the stereotype of BSGs, occur most often in the ventral pons, infiltrate throughout the brainstem, and have a uniformly poor prognosis. The nondiffuse brainstem tumors include focal midbrain, dorsally exophytic, and cervicomedullary tumors. Almost all these tumors are slow-growing, low-grade neoplasms that have a more favorable prognosis and response to treatment (specifically surgery) than the diffuse intrinsic gliomas. The management plan for these tumors is individualized to each distinct brainstem tumor type and is based strongly upon their MRI characteristics, suspected histology, and clinical presentations. It should be appreciated that nonneoplastic conditions such as brain abscess, neuroepithelial cyst, and demyelinating disorders can also present with lesions in the brainstem, but these entities are rare and will not be discussed further.
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Sanai, N., Prados, M. (2010). Brainstem Gliomas. In: Gupta, N., Banerjee, A., Haas-Kogan, D. (eds) Pediatric CNS Tumors. Pediatric Oncology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-87979-4_3
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