Possibility of using laser spectroscopy for the intraoperative detection of nonfluorescing brain tumors and the boundaries of brain tumor infiltrates

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  • 1 Department of Neurosurgery, Kitasato University School of Medicine, Sagamihara, Kanagawa; and Department of Neurosurgery, Kitasato Institute Medical Center Hospital, Kitamoto, Saitama, Japan
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✓The response of nonfluorescing infiltrating tumors that had been exposed to 5–aminolevulinic acid and irradiated using a laser at a wavelength of 405 nm was analyzed intraoperatively using spectroscopy. Histological analyses demonstrated that neoplastic cells were present in the tissue region that displayed a peak at 636 nm, whereas no neoplastic cells were present in the region that exhibited only the excitation light peak. The authors conclude that the intraoperative use of laser spectroscopy can allow the diagnosis of infiltrating tumor and the detection of boundaries of the infiltrate when standard fluorescence techniques fail.

Abbreviations used in this paper:

5-ALA = 5–aminolevulinic acid; MR = magnetic resonance.

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