Abstract
Intraventricular meningiomas (IVMs) are rare tumors of which the majority is located in the lateral ventricles. Most published series on the subject includes only a few patients. We analyzed our series of IVMs with a special interest in clinical features, outcome, and complications related to surgery. Twenty-two patients underwent resection of IVMs from 1990 to 2010 at Oslo University Hospital. Surgical and medical records were retrospectively analyzed. The IVMs were located in the trigonum of the lateral ventricles (20/22), in the third ventricle (1/22), and in the fourth ventricle (1/22). The most common symptoms and signs were headache, vertigo, nausea/vomiting, mental disturbances, balance impairment, and corticospinal tract signs. Visual field deficit was present preoperatively in two patients. Tumors of the lateral ventricles were resected via a transcortical parieto-occipital approach; the tumors in the third and fourth ventricle via a frontal transcortical and suboccipital route, respectively. Complete tumor resection was achieved in all but one case. Histology was WHO grade I in 20/22 and grade II in 2/22. Surgical mortality was 0 %. Most symptoms and signs resolved after surgery. The most common complication was visual field defect: four patients developed new-onset contralateral homonymous quadrant anopia and one patient developed hemianopia. Symptomatic IVMs should be resected, and most symptoms and signs resolve after surgery. The main challenge is to avoid damaging the geniculucalcarine tract when resecting IVMs in the trigonum. Preoperative diffusion tensor imaging-based tractography to map the geniculocalcarine tract could be a useful adjunct in the preoperative planning before selecting the surgical approach.
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Acknowledgments
We thank Elisabeth Elgesem and Hanne Vebenstad for excellent secretarial assistance. We thank Dr. Ane Konglund, medical student; Filip Hasseleid, medical student; Andreas Mathiesen, medical student; and Andreas Schei Hessen for help with data collection.
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Makoto Nakamura, Hannover, Germany
The authors present a well written and interesting surgical series of 22 patients with intraventricular meningiomas operated between 1990 and 2010. A retrospective analysis of the clinical, radiological and surgical data was conducted.
Among intraventricular meningiomas, the trigonum is the most common location. The superior parieto-occipital transcortical approach is the most favorable approach for microsurgical resection of these tumors. The authors accomplished to treat their patients with very low morbidity using this approach. However, postoperative new onset visual field deficit is a well-known problem, which can be associated with the surgical treatment of trigonal meningiomas. Modern imaging studies using DTI of the optic radiation may help in detailed surgical planning and hopefully in further reduction of damage to the optic radiation.
The authors present a well-written manuscript with an up to date review of previously published series. The discussion deals with several aspects of the epidemiology, clinical presentation, and surgical treatment options of this rare entity.
Karl Schaller, Geneva, Switzerland
The authors report on their institutional series of n = 22 intraventricular meningiomas, which had been treated over a period of time of 20 years. Twenty of the meningiomas were located in the trigonum on either side; and n = 20 were WHO I, and two WHO II. Five patients who had been operated via the parietooccipital transparenchymal approach developed new visual deficits, whereas pre-existing nonspecific symptoms (headache etc.) resolved in all. None of the deaths during follow-up was tumor related. The authors conclude that these tumors should be removed, as mostly feasible, and that DTI should be included in surgical planning in order to help avoid new onset of visual field deficits.
Although not very original by nature, this study is a relevant retrospective analysis of a rare clinical entity. The neurosurgical difficulties with these particular tumors relate to the determination of adequate surgical accessibility of those mainly, which are located in the ventricular trigonum on the dominant, and on the nondominant side. Those located in the third and fourth ventricles may be accessed by less controversial approaches, except for the never-ending debate of interhemispheric interforniceal vs. the transparenchymal approach. The authors provide a credible work-up of their series. As with such a long period of observation, it is not possible to judge inasmuch DTI-based neuronavigation might have influenced the visual outcome of their series (25 % deterioration) for the better. Since early 1990s, our technical armamentarium and the ways for intra-operative surveillance have changed considerably, and the lesson what can be learnt from the important experience of the authors is that careful planning, including functional imaging and fiber tracking, both integrated in neuronavigation, and intra-operative monitoring of visually evoked potentials should be part of appropriate contemporary management of these trigonal lesions. During the observational period of time of the reported series, the possibilities for intra-operative surveillance have gone beyond the sole monitoring of the motor tract, and the value of detailed neuroposychological testing, before and after abording trigonal lesions in the dominant lobe, cannot be overestimated according to this reviewer’s experience. Having not seen as many trigonal meningiomas as the authors as I must admit, I do still remember a few—most of which had been calcified. As with other possible incidentalomas I would, if the tumor remains asymptomatic, rather vote for continuing MRI surveillance of calcified ventricular lesions, and reserve surgery for those only which become symptomatic or which exhibit growth.
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Ødegaard, K.M., Helseth, E. & Meling, T.R. Intraventricular meningiomas: a consecutive series of 22 patients and literature review. Neurosurg Rev 36, 57–64 (2013). https://doi.org/10.1007/s10143-012-0410-5
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DOI: https://doi.org/10.1007/s10143-012-0410-5