Abstract
Background
For a long time, surgery of insular gliomas was considered at high risk for postoperative cognitive deficits, but recent studies highlighted the feasibility of the surgical approach. The aims of our study were to investigate the presence of language impairment before and after surgery and the relationship between language impairment and tumor volume preoperatively and extent of resection (EOR) 3 months after surgery.
Methods
Thirty-five patients with insular gliomas underwent an extensive language assessment before and few days after surgery, and after 3 months. Intraoperative neurophysiological monitoring (IOM) and brain mapping with direct electrical stimulation (DES) were used in all the cases; 8 patients underwent awake craniotomy. Statistical analysis was performed on the language tests administered.
Results
Patients with pure left insular lesion showed language impairment before and after surgery. Overall, patients with a left lesion showed a drop of performance after surgery followed by a partial recovery. Moreover, when the tumor involved the insula and adjacent networks, we observed a more severe deficit. No correlations were found between tumor volume, EOR, and language impairment.
Conclusions
Left insular lobe is an important hub in language networks; its involvement determines pre- and postsurgical deficits, together with the involvement of white matter connections. Tumor volume and EOR are not risk factors per se directly related to language functioning. Surgery of insular gliomas is possible with a pre- and intraoperative extensive study of the patient with IOM and awake surgery, and encouraged by the trend of cognitive recovery highlighted.
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Abbreviations
- DES:
-
Direct electrical stimulation
- EOR:
-
Extent of resection
- F:
-
Female
- FI:
-
Fronto-insular
- FR:
-
Face Recognition
- FTI:
-
Fronto-temporo-insular
- HGG:
-
High-grade glioma
- I:
-
Insular
- IOM:
-
Intraoperative neurophysiological monitoring
- LGG:
-
Low-grade glioma
- LH:
-
Left hemisphere
- M:
-
Male
- MR:
-
Magnetic resonance
- NWR:
-
Non-Word Repetition
- ON:
-
Object Naming
- PF:
-
Phonemic Fluency
- RH:
-
Right hemisphere
- SD:
-
Standard deviation
- SF:
-
Semantic Fluency
- SR:
-
Sentence Repetition
- TI:
-
Temporo-insular
- TT:
-
Token Test
- VN:
-
Verb Naming
- WHO:
-
World Health Organization
- WR:
-
Word Repetition
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Zarino, B., Sirtori, M.A., Meschini, T. et al. Insular lobe surgery and cognitive impairment in gliomas operated with intraoperative neurophysiological monitoring. Acta Neurochir 163, 1279–1289 (2021). https://doi.org/10.1007/s00701-020-04643-9
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DOI: https://doi.org/10.1007/s00701-020-04643-9