Harmful effects tend to result from pressure applied at the site of the tumor as well as
sites distal from the tumor.
Surgery is the best treatment.
-When the tumor is located in a relatively inaccessiable part of the brain for surgery
Chemotherapy or radiotherapy is used as a treatment.
Metastatic tumors (Metastases) - secondary tumors that form from migrated tumor tissue.
-More common for the original tumor to be located outside of the CNS
-Simple metastatic tumors - only one tumor forms at one side.
Surgical or radiological treatment
-Multiple metastatic tumors - usually spreading from the lungs to the CNS.
Whole-brain radiotherapy or chemotherapy (most common), but prognosis is quite poor.
Neuropsychological effects of tumors
-The behavioural symptoms that arise from the formation of a tumor vary widely, just as the
size, location, cell type, and growth rate of the tumors varies.
E.g. located near the primary visual cortex - cause blindness
-To the brain damage caused by infiltration and compression, tumors can cause epileptic
seizures and release substances that are toxic to the brain.
-Cerebrovascular disorder (stroke) - when the blood supply to the brain is interrupted (can be
sudden/gradual, complete/relative, permanent/transient)
-Cerebrovascular accident (CVA) - a class of cerebrovascular disorders, which result in
interruptions to the brain's blood supply.
Results in cerebral ischemia (lack of blood supply to the brain). If the cerebral ischemia
is severe or long-lasting enough to kill neurons, the damaged area is called an infarct.
CVA in small, minor arteries >> infarcts = small;
CVA in major vessel >> infarcts = large
-Thrombosis - a blood clot that remains at the point at which it was formed
Most common cause: Atherosclerosis () (fatty deposits build up inside the walls of
blood vessels, constricting the vessel more and more and possibly even completely
Because atherosclerosis often forms where two relatively large arteries branch off
from one single artery (bifurcation), the construction of blood flow tends to
influence relatively large areas of the brain.
-Embolism - a clot (can be another substance, e.g. bubble of air / piece of fat) that travels in
the bloodstream from one part of the body to another.
Substance travels from a spot where the arteries are relatively large to a place where the
arteries are smaller than the point of original formation, so a clot that previously did not
completely block the flow of blood might suddenly do so at another location.
-Hemorrhage - interruption in blood supply to the brain can be caused by the breakage of a