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Hematologic malignancy Hematological malignancies are cancers that affect the blood and lymph system. The cancer may begin in blood-forming tissue (e.g., bone marrow), or in the cells of the immune system. Some types of hematologic malignancies include: Leukemia; Non-Hodgkin lymphoma; Hodgkin lymphoma; Multiple myeloma; For more information about hematologic malignancies, including common symptoms and treatment options, see blood cancers.
Gliomas are the most commonly diagnosed of both benign and malignant primary brain tumors, accounting for approximately 45-50% of all primary brain tumors. The most common gliomas are: astrocytomas, ependymomas, oligodendrogliomas and tumors with mixtures of two or more of these cell types. Grades I and II astrocytomas account for 25-30% of all gliomas. The most frequently diagnosed types of astrocytoma are pilocytic astrocytoma, grade II astrocytoma, anaplastic astrocytoma and glioblastoma multiforme. Astrocytomas. Pilocytic Astrocytoma Pilocytic astrocytomas, which are grade I tumors, are considered benign because they do not invade the surrounding normal brain tissue.