meningioma

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Related to meningiomas: gliomas, Pituitary adenomas

meningioma

 [mĕ-nin″je-o´mah]
a hard, usually vascular tumor occurring mainly along the meningeal vessels and superior longitudinal sinus, invading the dura and skull and leading to erosion and thinning of the skull.
angioblastic meningioma angioblastoma (def. 2).

me·nin·gi·o·ma

(mĕ-nin'jē-ō'mă),
A benign, encapsulated neoplasm of arachnoidal origin, occurring most frequently in adults; most common form consists of elongated, fusiform cells in whorls and pseudolobules with psammoma bodies frequently present; meningiomas tend to occur along the superior sagittal sinus, along the sphenoid ridge, or in the vicinity of the optic chiasm; in addition to meningothelial meningioma, fibrous, transitional, metaplastic, psammomatous, secretory, clear cell, papillary, rhabdoid, chordoid, lymphoplasmocytic, angiomatous, microcystic, rhabdoid, atypical, and anaplastic varieties are recognized.
[mening- + G. -oma, tumor]

meningioma

/me·nin·gi·o·ma/ (mĕ-nin″je-o´mah) a benign, slow-growing tumor of the meninges, usually next to the dura mater, which may invade the skull or cause hyperostosis, and often causes increased intracranial pressure; it is usually subclassified on the basis of anatomic location.
angioblastic meningioma  one containing many blood vessels of various sizes.
convexity meningiomas  a diverse group of meningiomas located within the sulci of the brain, usually anterior to the rolandic fissure.
psammomatous meningioma  one containing many psammoma bodies.

meningioma

(mə-nĭn′jē-ō′mə)
n. pl. meningio·mas or meningio·mata (-mə-tə)
A slow-growing tumor of the meninges, occurring most often in adults.

meningioma

[minin′jē·ō′mə] pl. meningiomas, meningiomata
Etymology: Gk, meninx, membrane, oma, tumor
a mesenchymal fibroblastic tumor of the membranes enveloping the brain and spinal cord. Meningiomas grow slowly, are usually vascular, and occur most commonly near the superior longitudinal transverse and cavernous sinuses of the dura mater of the brain. The tumors may be nodular, plaquelike, or diffuse lesions that invade the skull, causing bone erosion and compression of brain tissue. Meningiomas usually occur in adults.
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Meningioma

meningioma

A tumour of meninges and meningeal cells, which is most common in middle-aged women and may occur in a background of neurofibromatosis type 2. Aggressive meningiomas are characterised by bone destruction, florid mitotic activity and metastases.
 
Clinical findings
Often asymptomatic, slow-growing masses attached to the dura, usually where arachnoid villi are prominent. The symptoms are related to tumour growth and compression. 

Prognosis
5-year survival, 70%.

Types
Grade 1—Benign/typical
• Angiomatous
• Fibrous (fibroblastic)
• Lymphoplasmacyte-rich
• Meningiothelial
• Metaplastic
• Microcystic
• Psammomatous
• Secretory
• Transitional (mixed)

Grade 2—Atypical
• Chordoid
• Clear cell
• Oncocytic

Grade 3—Malignant/anaplastic
• Anaplastic
• Papillary
• Rhabdoid

meningioma

Neurosurgery A tumor of meninges and meningeal cells, most common in middle-aged ♀ Clinical Often asymptomatic, usually slow-growing masses, attached to dura, usually where arachnoid villi are prominent; Sx are related to tumor growth and compression Prognosis 5-yr survival 70%. See Malignant meningioma.

me·nin·gi·o·ma

(mĕ-nin'jē-ō'mă)
A benign, encapsulated neoplasm of arachnoidal origin, occurring most frequently in adults; most frequent form consists of elongated, fusiform cells in whorls and pseudolobules with psammoma bodies frequently present; meningiomas tend to occur along the superior sagittal sinus, along the sphenoid ridge, or in the vicinity of the optic chiasm; in addition to meningothelial meningioma, angiomatous, chondromatous, osteomatous, lipomatous, melanotic, fibroblastic and transitional varieties are recognized.
[mening- + G. -oma, tumor]

meningioma

A tumour of the cells of the MENINGES. Most meningiomas are fixed to the DURA MATER and are benign but, because of their location and the bony surroundings of the nervous system, may do serious damage by compression of neurological structures. Treatment is by surgical removal and this is often successful.

me·nin·gi·o·ma

(mĕ-nin'jē-ō'mă)
A benign, encapsulated neoplasm of arachnoidal origin, occurring most frequently in adults; tends to occur along the superior sagittal sinus, along the sphenoid ridge, or in the vicinity of the optic chiasm.
[mening- + G. -oma, tumor]

meningioma

(mənin´jēō´mə),
n a mesenchymal fibroblastic tumor of the membranes enveloping the brain and spinal cord. They grow slowly, are usually vascular, and occur most commonly near the superior longitudinal, transverse, and cavernous sinuses of the dura mater of the brain.

meningioma

a common, well-defined, firm intracranial neoplasm of animals arising from leptomeningeal cells, which occurs in basal locations, over the cerebral, cerebellar convexities, and in the spinal cord. One subtype is characterized by psammoma bodies (central calcified material).

angioblastic meningioma
angioblastoma.
epithelioid meningioma
see meningotheliomatous meningioma (below).
meningotheliomatous meningioma
a diffusely cellular mesodermal tumor with cells in sheets or in pseudoalveoli.
References in periodicals archive ?
3%) were the most common tumours, followed by meningiomas (22.
Approximately, 15-20% of primary tumours in adults are meningiomas, most of them (75%) found supratentorially.
Los meningiomas son tumores generalmente del adulto, la exeresis completa es el tratamiento de eleccion, excepcionalmente aparecen en pacientes jovenes donde adoptan un patron de alta agresividad.
The differential for an extra-axial enhancing lesion on MRI includes meningioma, hemangiopericytoma, and metastasis.
Los principios de la reseccion de los meningiomas petroclivales se basan en las tecnicas que eliminen o minimicen la retraccion del tallo cerebral y eliminen la injuria venosa, especialmente de la vena de Labbe (17).
Usually, rhabdoid meningiomas are classified based on physical appearance and characteristics, but these enigmatic tumors can be difficult for pathologists to accurately classify.
The error was in misinterpreting microcystic meningioma (WHO grade I) as a malignant neoplasm or high-grade tumor, and misdiagnosing central neurocytoma (WHO grade II) as a low-grade glioma.
Hearing loss, tinnitus and headache were the most consistent symptom which occurred in the entire CP angle tumors whereas facial weakness was more common in meningioma and epidermoids.
The incidences of postoperative epilepsy after tuberculum sellae meningiomas (TSM) surgery in the literature ranges from 2% to 11%.
Most reported intracranial hemorrhages associated with meningiomas are found in the subarachnoid and subdural spaces.
6,7] This case report presents the case of a sphenoid wing meningioma in a patient who presented with cognitive impairment.
Progressive visual acuity loss and defects of certain parts of visual field are an indication for surgical treatment of meningiomas [3, 4, 7-9].