title: Analysis of the surgical benefits of 5-ALA-induced fluorescence in intracranial meningiomas: experience in 204 meningiomas.
abstract: OBJECTIVE One of the most important causes for recurrence of intracranial meningiomas is residual tumor tissue that remains despite assumed complete resection. Recently, intraoperative visualization of meningioma tissue by 5-aminolevulinic acid (5-ALA)-induced protoporphyrin IX (PpIX) fluorescence was reported. The aim of this study was to investigate the possible surgical benefits of PpIX fluorescence for detection of meningioma tissue. METHODS 5-ALA was administered preoperatively to 190 patients undergoing resection of 204 intracranial meningiomas. The meningiomas' PpIX fluorescence status, fluorescence quality (strong or vague), and intratumoral fluorescence homogeneity were investigated during surgery. Additionally, specific sites, including the dural tail, tumor-infiltrated bone flap, adjacent cortex, and potential satellite lesions, were analyzed for PpIX fluorescence in selected cases. RESULTS PpIX fluorescence was observed in 185 (91%) of 204 meningiomas. In the subgroup of sphenoorbital meningiomas (12 of 204 cases), the dural part showed visible PpIX fluorescence in 9 cases (75%), whereas the bony part did not show any PpIX fluorescence in 10 cases (83%). Of all fluorescing meningiomas, 168 (91%) showed strong PpIX fluorescence. Typically, most meningiomas demonstrated homogeneous fluorescence (75% of cases). No PpIX fluorescence was observed in any of the investigated 89 dural tails. In contrast, satellite lesions could be identified through PpIX fluorescence in 7 cases. Furthermore, tumor-infiltrated bone flaps could be visualized by PpIX fluorescence in all 13 cases. Notably, PpIX fluorescence was also present in the adjacent cortex in 20 (25%) of 80 analyzed cases. CONCLUSIONS The authors' data from this largest patient cohort to date indicate that PpIX fluorescence enables intraoperatively visualization of most intracranial meningiomas and allows identification of residual tumor tissue at specific sites. Thus, intraoperative detection of residual meningioma tissue by PpIX fluorescence might in future reduce the risk of recurrence.
authors.affiliation: Department of Neurosurgery.|Comprehensive Cancer Center-Central Nervous System Tumors Unit, and.
authors.forename: Matthias
authors.initials: M
authors.lastname: Millesi
authors.affiliation: Department of Neurosurgery.|Comprehensive Cancer Center-Central Nervous System Tumors Unit, and.
authors.forename: Barbara
authors.initials: B
authors.lastname: Kiesel
authors.affiliation: Department of Neurosurgery.
authors.forename: Mario
authors.initials: M
authors.lastname: Mischkulnig
authors.affiliation: Department of Neurosurgery.
authors.forename: Mauricio
authors.initials: M
authors.lastname: Martínez-Moreno
authors.affiliation: Comprehensive Cancer Center-Central Nervous System Tumors Unit, and.|Institute of Neurology, Medical University of Vienna, Austria.
authors.forename: Adelheid
authors.initials: A
authors.lastname: Wöhrer
authors.affiliation: Department of Neurosurgery.|Comprehensive Cancer Center-Central Nervous System Tumors Unit, and.
authors.forename: Stefan
authors.initials: S
authors.lastname: Wolfsberger
authors.affiliation: Department of Neurosurgery.|Comprehensive Cancer Center-Central Nervous System Tumors Unit, and.
authors.forename: Engelbert
authors.initials: E
authors.lastname: Knosp
authors.affiliation: Department of Neurosurgery.|Comprehensive Cancer Center-Central Nervous System Tumors Unit, and.
authors.forename: Georg
authors.initials: G
authors.lastname: Widhalm
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001932:Brain Neoplasms / Q000000981:diagnostic imaging* / Q000601:surgery*; D005260:Female; D005453:Fluorescence; D006801:Humans; D007982:Levulinic Acids; D008297:Male; D008577:Meningeal Neoplasms / Q000000981:diagnostic imaging* / Q000601:surgery*; D008579:Meningioma / Q000000981:diagnostic imaging* / Q000601:surgery*; D008875:Middle Aged; D016343:Monitoring, Intraoperative / Q000379:methods*; D018365:Neoplasm, Residual; D055815:Young Adult; D000622:Aminolevulinic Acid
chemical_list: D007982:Levulinic Acids; D000622:Aminolevulinic Acid
keywords: 5-ALA; 5-ALA = 5-aminolevulinic acid; PpIX = protoporphyrin IX; PpIX fluorescence; WHO = World Health Organization; bone invasion; meningioma; oncology; satellite lesions