Lateral Intraventricular Anaplastic Meningioma: A Series of 5 Patients at a Single Institution and Literature Review

Objective Lateral intraventricular anaplastic meningiomas (LIAMs) are rare lesions. The aim of this study is to clarify clinical and radiologic characteristics and the optimal treatment strategies of LIAMs with long-term follow-up. Methods From September 2008 to September 2017, 5 patients with LIAM were enrolled in our study. The clinical profiles, radiologic features, treatment strategies, and outcomes were retrospectively analyzed. Results Five patients (all female; mean age, 48.8 years; range, 33–61 years) were included in this study. The most frequent symptoms were those related to increased intracranial pressure. Mean duration of symptoms was 6.7 months (range, 2 weeks–2 years). The average tumor size was 4.98 cm at the maximal diameter (range, 3.0–6.2 cm). All were confirmed with a diagnosis of anaplastic meningioma. Gross total resection was achieved in all 5 patients. All patients experienced improvement of symptoms. Recurrence and progression were identified in only 2 patients. At the last follow-up, the mean recurrence-free survival was 13 months (range, 7–21 months) and the mean overall survival was 16.25 months (range, 8–21 months). One patient was lost to follow-up. Conclusions Female and right trigone area predominance were found in our case series. Shorter duration of symptoms, irregular tumor shape, peritumoral edema, and heterogeneous enhancement may indicate an aggressive feature. Maximal safe resection followed by radiation therapy may be the best strategy for patients with LIAM. Long-term clinical follow-up and serial imaging are recommended.