Acoustic Neuroma Causes. There are two types of acoustic neuroma: a sporadic form and a form associated with a syndrome called neurofibromatosis type II (NF2). NF2 is an inherited disorder characterized by the growth of noncancerous tumors in the nervous system. Acoustic neuromas are the most common of these tumors and often occur in both ears by age 30.
Acute myeloid leukemia (AML) has many other names, including acute myelocytic leukemia, acute myelogenous leukemia, acute granulocytic leukemia, and acute non-lymphocytic leukemia. “Acute” means that this leukemia can progress quickly if not treated, and would probably be fatal in a few months.
Acute lymphocytic leukemia (ALL), also called acute lymphoblastic leukemia, is a cancer that starts from the early version of white blood cells called lymphocytes in the bone marrow (the soft inner part of the bones, where new blood cells are made). Leukemia cells usually invade the blood fairly quickly.
Leukemias are cancers that start in cells that would normally develop into different types of blood cells. Here we will talk about acute myeloid leukemia (AML). Acute myeloid leukemia (AML) has many other names, including acute myelocytic leukemia, acute myelogenous leukemia, acute granulocytic leukemia, and acute non-lymphocytic leukemia.
The information here focuses on small cell lung cancer. See Lung Cancer (Non-Small Cell) for information about that type of lung cancer. Other types of lung cancer and tumors. Lung carcinoid tumors: Less than 5% of lung tumors are carcinoid tumors of the lung. Most of these grow slowly. For more information about these tumors, see Lung Carcinoid Tumor.
Chordoma is a rare slow-growing neoplasm thought to arise from cellular remnants of the notochord. The evidence for this is the location of the tumors (along the neuraxis), the similar immunohistochemical staining patterns, and the demonstration that notochordal cells are preferentially left behind in the clivus and sacrococcygeal regions when the remainder of the notochord regresses during fetal life.
Because primary CNS lymphoma spreads throughout the brain, external radiation therapy is given to the whole brain. This is called whole brain radiation therapy. Internal radiation therapy uses a radioactive substance sealed in needles, seeds, wires, or catheters that are placed directly into or near the cancer.
Craniopharyngioma is a rare, usually suprasellar neoplasm, which may be cystic, that develops from nests of epithelium derived from Rathke's pouch. Rathke's pouch is an embryonic precursor of the anterior pituitary. Craniopharyngiomas are typically very slow growing tumors.
Overview of astrocytomas. Grade I: Pilocytic astrocytoma; Grade II: Diffuse astrocytoma / Low-grade astrocytoma; Grade III: Anaplastic astrocytoma ; Grade IV: Glioblastomas (also called glioblastoma multiforme, GBM, or grade IV astrocytoma). Anaplastic astrocytomas and glioblastomas are malignant astrocytomas that grow and spread aggressively, accounting for more than 50 percent of all astrocytomas. Glioblastomas occur most often in adults between the ages of 50 and 70.
They are considered low-grade (grade II), but they can develop into higher-grade tumors. Pineal astrocytic tumors can be any grade. They form around the pineal gland. This tiny organ in the cerebrum makes melatonin, which helps control sleep and waking. Brain stem gliomas are rare in adults.
Anaplastic astrocytoma is a rare malignant brain tumor. Astrocytomas are tumors that develop from certain star-shaped brain cells called astrocytes. Astrocytes and similar cells form tissue that surrounds and protects other nerve cells found within the brain and spinal cord.
Malignant tumor or malignant neoplasm. A cancerous tumor, or abnormal growth of cells. Neoplasms, or the cells that make up malignant tumors, invade nearby healthy tissue and may metastasize (spread) to other areas of the body. A malignant tumor is the opposite of a benign (noncancerous) tumor.
A meningioma is a tumor that forms on membranes that cover the brain and spinal cord just inside the skull. Specifically, the tumor forms on the three layers of membranes that are called meninges. These tumors are often slow-growing. As many as 90% are benign (not cancerous). Most meningiomas occur in the brain.
About 33 percent of all brain tumors are gliomas, which originate in the glial cells that surround and support neurons in the brain, including astrocytes, oligodendrocytes and ependymal cells. Gliomas are called intra-axial brain tumors because they grow within the substance of the brain and often mix with normal brain tissue.