Praxis
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Malignant gliomas, among others the glioblastoma multiforme, are the most frequent brain tumors. The glioblastoma itself represents the most unfavorable tumor. In Switzerland, about 450 humans contract a glioblastoma each year. ⋯ A preoperative administered substance colors the tumor and makes it better visible for the neurosurgeon. Consequently, the healthy brain tissue can be better distinguished from the tumor. This permits not only a larger complete surgical resection of the tumor but also minimizes the resection of healthy tissue.