Читать книгу Anterior Skull Base Tumors - Группа авторов - Страница 58

The majority of meningiomas of the skull base sites are typically an extension from an intracranial primary. Primary meningiomas are rare and most likely arise from ectopic meninges and arachnoid cell rests of cranial nerve sheaths. An origin at the transition between endoneurium of the olfactory nerve and cribriform plate has also been suggested.

At histology, skull base extracranial meningiomas are morphologically identical to their intracranial counterpart, but tend to be locally invasive, frequently showing characteristic whirling. They are typically meningothelial or fibroblastic, but other types may also be found [103–106].