Astrocytomas are a type of cancer of the brain. They originate in a particular kind of glial cells, star-shaped brain cells in thecerebrum called astrocytes. This type of tumor does not usually spread outside the brain and spinal cord and it does not usually affect other organs. Astrocytomas are the most common glioma and can occur in most parts of the brain and occasionally in the spinal cord. Within the astrocytomas, there are two broad classes recognized in literature, those with:
Narrow zones of infiltration (mostly noninvasive tumors; e.g., pilocytic astrocytoma, subependymal giant cell astrocytoma, pleomorphic xanthoastrocytoma), that often are clearly outlined on diagnostic images
Diffuse zones of infiltration (e.g., high-grade astrocytoma, anaplastic astrocytoma, glioblastoma), that share various features, including the ability to arise at any location in the CNS (Central Nervous System), but with a preference for the cerebral hemispheres; they occur usually in adults; and an intrinsic tendency to progress to more advanced grades.
People can develop astrocytomas at any age. The low-grade type is more often found in children or young adults, while the high-grade type are more prevalent in adults. Astrocytomas in the base of the brain are more common in young people and account for roughly 75% of neuroepithelial tumors
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http://www.jebmh.com/data_pdf/srinivas%20rao%20-%201.pdf k. srinivasa rao, i. lakshmi spandana, sanjeeva kumar desai. ”phakomatosis: intresting cases of tuberous sclerosis with retinal astrocytoma”. journal of evidence based medicine and healthcare; volume 2, issue 20, may 18, 2015; page: 3052-3058.
https://www.hindawi.com/journals/cripa/2014/153197/ maher kurdi, hosam al-ardati, and saleh s. baeesa, “malignant trigeminal nerve sheath tumor and anaplastic astrocytoma collision tumor with high proliferative activity and tumor suppressor p53 expression,” case reports in pathology, vol. 2014, article id 153197, 6 pages, 2014. doi:10.1155/2014/153197
deshmukh ys, atre al, vhora ss, karnik sv. a case report on paraneoplastic encephalitis associated with astrocytoma - an unknown entity. indian j radiol imaging [serial online] 2016 [cited 2016 nov 24];26:140-4. available from: http://www.ijri.org/text.asp?2016/26/1/140/178365