a surgical carbon dioxide laser unit ( laser ) has been used since 1977 in twenty-five cases of various brain tumours , including ten meningiomas ( four sphenoid ridge , two parasagittal , two falx , one olfactory , one posterior fossa ) , eleven gliomas ( seven glioblastoma , four astrocytoma ) , two metastatic brain tumours , one haemangioblastoma , and one arteriovenous malformation ( avm ) .
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