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Background: To the authors' knowledge, meningiomas of the posterior third of the falx and the parasagittal sinus have never been specifically described to date and correlated visual outcome remains unclear. With this retrospective study we describe the clinical characteristics of these tumours, their surgical management, and the improvement in visual disturbances after surgery. Methods: Twenty-six consecutive patients (22 females, 4 males; mean age, 54 years) operated on for parasagittal ( n = 22) and falcine ( n = 4) meningioma between 1990 and 2010 were analysed retrospectively. Preoperative planning included magnetic resonance imaging (MRI) and magnetic resonance venography (MRV) or angiography. Sinus invasion was classified as normal, stenotic or occluded from the imaging findings and according to the Sindou classification from the intraoperative notes. Results: Visual disturbances and headache (in 21 and 14 cases, respectively) were the most commonly referred symptoms; visual field deficit was present in 19 patients. Simpson grade I was obtained in four patients, grade II in 15, grade III in three, and grade IV in four. The main limiting factor for total removal was sinus involvement. No perioperative deaths or relevant postoperative complications occurred. The mean follow-up was 107 months. Visual field deficit improved or resolved in almost half of the patients during the follow-up period. Three (12%) patients relapsed, two were treated with Gamma Knife surgery (stable at current writing) and the third died of disease progression. Conclusions: Outcome after surgery compares favourably with other parasagittal meningioma localisations and overall morbidity is negligible. Visual function is crucial for clinical outcome. Since an improvement of the deficit might still be possible, every effort should be undertaken to preserve the visual cortex. [ABSTRACT FROM AUTHOR]

Background Falcotentorial meningiomas (FTM) stand out for their rarity, inconsistent definition, and surgical complexity. It is appropriate to deal with them in the context of medial tentorial meningiomas (TMs). Methods Clinical and radiologic characteristics of medial TMs, comprising the typical features of FTM and TM, along with surgical management and short-term and long-term outcomes, are reported. Results FTM ( n = 16) were typically supratentorial, large, edematous tumors that caused mainly headache and hemianopia; TM ( n = 12) were infratentorial, smaller not edematous tumors that caused mainly headache and gait ataxia. The most frequent venous pattern was straight sinus infiltration in one third of cases of FTM and occlusion in one half of cases of TM. Total removal (Simpson grade I–II) was obtained in 46.4% of cases and subtotal removal (Simpson grade III–IV) in 53.6%. Suprainfratentorial extension in FTM and incomplete venous invasion in TM were the factors most likely opposing complete removal. The overall acute complications rate was 32.1% (higher for FTM), transient for most cases. Patients with supratentorial meningiomas performed significantly worse preoperatively (Karnofsky Performance Status ≤70 in 75% of cases); patients with infratentorial symptoms/signs recovered worse postoperatively. Stereotactic radiosurgery with subtotal removal was used as adjuvant treatment in 8 cases. Only 2 recurrences, both atypical tumors, occurred at 57.6 months (mean) follow-up. Conclusions As a general rule, careful venous management, tailored surgical approach for FTM, and cautious tumor removal for TM can yield good and stable results. Total removal accounts for half the cases in both groups, whereas FTM was associated with worse postoperative complications. [ABSTRACT FROM AUTHOR]