What is Angiomatous meningioma?

Angiomatous meningiomas, as their name suggests, demonstrate abundant blood vessels (greater than 50% of a whole tumor) within a tumor with areas of classic meningothelial differentiation 1. They are considered WHO grade I tumors and cellular atypia and anaplasia is not present 3.

How is Angiomatous meningioma diagnosed?

On histology, the main differential diagnosis for angiomatous meningioma is hemangioblastoma, which usually shows a cystic lesion with a mural enhancing nodule on MRI. During intraoperative consultation, the hemangioblastoma can closely mimic angiomatous meningioma on frozen section.

What is Meningothelial meningioma?

Meningiomas, as defined by the 2016 World Health Organization (WHO), are “a group of mostly benign, slow-growing neoplasms that most likely derive from the meningothelial cells of the arachnoid layer.” These tumors fall into WHO grade I, with a low risk of recurrence and aggressive behavior; grades II and III indicate …

What is fibroblastic meningioma?

Fibrous meningiomas (also known as fibroblastic meningiomas) are the second most common histological subtype of meningioma, found in ~50% of all meningiomas, usually along with meningothelial histology (40%) or in isolation (7%).

What are Meningothelial cells?

Background information: Meningothelial cells (MECs) are the cellular components of the meninges protecting the brain and as such provide important barrier function for the central nervous system building the interface between neuronal tissue and the cerebrospinal fluid (CSF).

What is Parafalcine meningioma?

Parafalcine meningioma is a common meningioma located in the cerebral longitudinal fissure, originating from the cerebral falx, with the third highest morbidity among all the meningiomas, accounting for approximately 11%–14% deaths, ranking only second to the cerebral convexity meningioma and parasagittal meningioma ( …

What is a Grade 2 meningioma?

Grade II atypical meningiomas are mid-grade tumors. This means the tumors have a higher chance of coming back after being removed. The subtypes include choroid and clear cell meningioma. Grade III anaplastic meningiomas are malignant (cancerous). This means they are fast-growing tumors.