Histological examination of false positive tissue resection using 5-aminolevulinic acid-induced fluorescence guidance.
Intraoperative 5-aminolevulinic acid (5-ALA)-induced fluorescence guidance for resection of malignant brain tumors was correlated with histological examination to investigate false positive findings in 42 patients with malignant glioma and six patients with metastatic brain tumor. Patients received a single 1 g oral dose of 5-ALA 2 hours before surgery. The tumor site was illuminated with a laser with a peak wavelength of 405 +/- 1 nm and output of 40 mW. Samples with strong fluorescence were obtained from the tumor bulk and samples with weak fluorescence from the tumor cavity. Fluorescence was observed in 36 of the 42 malignant gliomas and four of the six metastatic brain tumors. No tumor cells were found in fluorescent samples from six of the 36 malignant gliomas and all four metastatic brain tumors. Five of the six malignant gliomas were recurrent cases. Fluorescence was found in areas of peritumoral edema or inflammatory cell and reactive astrocyte infiltration. Intraoperative 5-ALA-induced fluorescence guidance is useful for the resection of initial malignant glioma since false positive results are rare, but only non-eloquent weak positive areas should be resected. In contrast, all weak positive areas of recurrent malignant gliomas must be resected. Weak positive areas of the peritumoral edema surrounding metastatic brain tumors should be removed carefully as false positive results are common.
Utsuki
Satoshi
S
Department of Neurosurgery, Kitasato University School of Medicine, Kanagawa, Japan. utsuki@med.kitasato-u.ac.jp
Oka
Hidehiro
H
Sato
Sumito
S
Shimizu
Satoru
S
Suzuki
Sachio
S
Tanizaki
Yoshinori
Y
Kondo
Koji
K
Miyajima
Yoshiteru
Y
Fujii
Kiyotaka
K
D000622:Aminolevulinic Acid; D001932:Brain Neoplasms / Q000473:pathology* / Q000556:secondary / Q000601:surgery*; D005189:False Positive Reactions; D005453:Fluorescence; D005910:Glioma / Q000473:pathology* / Q000601:surgery*; D006801:Humans; D017319:Photosensitizing Agents
D017319:Photosensitizing Agents; D000622:Aminolevulinic Acid