Primary Intracranial Extradural Meningiomas

Abstract

Objective: We reviewed 17 cases of primary intracranial extradural meningiomas (PIEMs) (including our 5 cases) reported in the literature so as to develop a better understanding of their clinical characteristics, treatment, and prognosis. Materials and Methods:The clinical data of 17 cases of PIEMs, including our 5 cases, were analyzed on their demographic features, presenting symptoms and duration, imaging and surgical findings, surgical results, pathologic grades, histologic subtypes, and follow-up results.Results: PIEMs accounted for 0.04% to 0.14% of all meningiomas. The most common presenting symptom (41.2%) was a painless, gradually expanding mass in the region of the lesion. PIEMs being located in skull convexities constituted 88.2% of all cases, whereas skull bases only 11.8%. All PIEMs patients were uneventful perioperatively after complete resection of tumor except 1 who died of primary cardiac arrest during operation. A total of 88.2% of PIEMs were grade I, 11.8% grade II. Ten cases of PIEMs were given a mean 2.16-year follow-up. As a result, no recurrence and death were found.Conclusions: PIEMs have some marked clinical characteristics. Total tumor removal together with a wide excision of all involved tissues followed by the reconstruction of tissue defects is the best surgical project. The prognosis is excellent after surgical complete resection.

Meninges Outside the Meninges: Ectopic Meningiomas and Meningothlelial Proliferations

“…Combined with a previous review of 178 reported cases from the English language medical literature by Lang et al [8], Gibson cited an additional 100 cases of PEM at the time of publication of their chapter (2009). In this author's brief survey of the entire medical literature not restricted to the English language from 1/1/2008 to the present, approximately 184 cases of PEM are noted after using search terms that Gibson identified as descriptors for PEMs such as "ectopic", "extracranial", "extraneuraxial", "extradural", "cutaneous", "calvarial", "intraosseous" and "meningioma".…”