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Arachnoid granulations (also arachnoid villi, and Pacchionian granulations or bodies) are small outpouchings of the arachnoid mater and subarachnoid space into the dural venous sinuses of the brain. The granulations are thought to mediate the draining of cerebrospinal fluid (CSF) from the subarachnoid space into the venous system .
The arachnoid mater (or simply arachnoid) is one of the three meninges, the protective membranes that cover the brain and spinal cord. It is so named because of its resemblance to a spider web . The arachnoid mater is a derivative of the neural crest mesoectoderm in the embryo.
Secondary tumors are much more common than primary brain tumors, "as only approximately 90,000 people are diagnosed with a primary brain tumor each year," she explains.
It has been proposed that a positive biofeedback loop may exist, where raised ICP (intracranial pressure) causes venous narrowing in the transverse sinuses, resulting in venous hypertension (raised venous pressure), decreased CSF resorption via arachnoid granulation and further rise in ICP. [16]
However, it's the most common cancer in children and teenagers. Glioblastoma (GBM) is the most common and aggressive malignant brain tumor, accounting for about 15% of all primary malignant brain ...
Granular cell tumor is a tumor that can develop on any skin or mucosal surface, but occurs on the tongue 40% of the time. It is also known as Abrikossoff's tumor, [1] granular cell myoblastoma, [1] granular cell nerve sheath tumor, [1] and granular cell schwannoma. [1] Granular cell tumors (GCTs) affect females more often than males. [2]
A tumor growing from the meninges is referred to as a meningioma. Most meningiomas grow from the arachnoid mater inward applying pressure on the pia mater and therefore the brain or spinal cord. While meningiomas make up 20% of primary brain tumors and 12% of spinal cord tumors, 90% of these tumors are benign.
Since a small nodule can represent any tissue from a harmless nevus to a malignant tumor, this use of the term is not very specific. Examples of this use of the term granuloma are the lesions known as vocal cord granuloma (known as contact granuloma ), pyogenic granuloma , and intubation granuloma , all of which are examples of granulation ...