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Megalencephaly (or macrencephaly; abbreviated MEG) is a growth development disorder in which the brain is abnormally large. It is characterized by a brain with an average weight that is 2.5 standard deviations above the mean of the general population. [2]
Hydranencephaly is an extreme form of porencephaly, which is characterized by a cyst or cavity in the cerebral hemispheres. [citation needed]Although the exact cause of hydranencephaly remains undetermined in most cases, the most likely general cause is by vascular insult, such as stroke, injury, intrauterine infections, or traumatic disorders after the first trimester of pregnancy.
With limited research, the most commonly regarded cause of porencephaly is disturbances in blood circulation, ultimately leading to brain damage. [6] However, a number of different and multiple factors such as abnormal brain development or damage to the brain tissue can also affect the development of porencephaly. [2]
Metastatic brain cancer is over six times more common than primary brain cancer, as it occurs in about 10–30% of all people with cancer. [1] This is a list of notable people who have had a primary or metastatic brain tumor (either benign or malignant) at some time in their lives, as confirmed by public information. Tumor type and survival ...
Autosomal dominant porencephaly type I is a rare type of porencephaly that causes cysts to grow on the brain and damage to small blood vessels, which can lead to cognitive impairment, migraines, seizures, and hemiplegia or hemiparesis.
Even if, by general rule, neoplasms of the nervous system (brain tumors) cannot metastasize into the body because of the blood–brain barrier, anaplastic meningioma can. Although they are inside the cerebral cavity, they are located on the bloodside of the BBB, because meningiomas tend to be connected to blood vessels.
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Limited information was known about cerebral disorders until the development of modern technologies. Brain imaging and genetic sequencing greatly increased the information known about polymicrogyria within the past decade. [18] Understanding about development, classification and localization of the disorder have greatly improved. [18]