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The prognosis for a subependymoma is better than for most ependymal tumors, [3] and it is considered a grade I tumor in the World Health Organization (WHO) classification. They are classically found within the fourth ventricle , typically have a well demarcated interface to normal tissue and do not usually extend into the brain parenchyma ...
The pathophysiology of tuberculous meningitis involves bacterial invasion of the brain parenchyma meninges or cortex, causing the formation of small subpial foci. These foci, termed Rich foci, are necrotic and expand as the colonies within them multiply. Tubercle (focal) rupture in the subarachnoid space causes meningitis. [3]
Neurocysticercosis can be classified into two main types: parenchymal, which affects the brain tissue, and extraparenchymal, which occurs outside the brain tissue. [37] Parenchymal neurocysticercosis: neurocysticercosis lesions within brain parenchyma. [37] Viable parenchymal cysts: contains the scolex, typically between 0.5 and 2 cm in ...
It occurs in approximately 3-5% of cancer patients. [8] The disease is usually terminal and if left untreated, the median survival is 4–6 weeks whereas if treated, the median survival can increase to 2–3 months. [1] Treatment will be more effective if it is done on the primary tumor before it metastasizes to the brain or spinal cord.
Tabes dorsalis is a form of late neurosyphilis that affects the posterior columns of the spinal cord. Parenchymal syphilis occurs in the late stage of neurosyphilis, with average presentation occurring 15 to 25 years after initial infection. [3]
Various factors appear to contribute to life expectancy after diagnosis, with age playing a key part. ... at 65 could expect to live up to 8.9 years while those at 85 years could expect 4.5 years ...
Those with parenchymal contusion would require frequent follow-up imaging because such contusions may grow large enough to become hemorrhage and exerts significant mass effect on the brain. [3] Cerebral microhemorrhages is a smaller form of hemorrhagic parenchymal contusion and are typically found in white matter. Such microhemorrhages are ...
While these are the causative processes for most cases, a number of other pathological processes are known to accelerate or worsen them, including coagulopathy, vasculitis, brain tumors, ischemic stroke, vascular malformations, and others. In general, diseases and risk factors known to damage blood vessels are considered risk factors, but ...