Abstract
Object
The infrachiasmatic corridor is the most important surgical access route for craniopharyngiomas and was identified and used in clinical series. The aims of this study were to describe the characteristics that assist dissection and resection rates in endoscopic surgery of solid, cystic, and recurrent cases and their importance in the infrachiasmatic corridor in endoscopic surgery.
Methods
One hundred operations on 84 patients with pathologically identified craniopharyngioma were included in the study. The MRI findings were evaluated, and the location of the lesions was classified as (1) infrasellar; (2) sellar; or (3) suprasellar. In the sagittal plane, we measured the longest diameter of cystic and solid components and the height of chiasm-sella. Images were assessed for the extent of resection and were classified as gross total resection. This was deemed as the absence of residual tumor and subtotal resection, which had residual tumor.
Results
The infrasellar location was reported in 7/84 (8.3%) patients, the sellar location in 8/84 (9.5%), and the suprasellar location in 69/84 (82.1%) patients. The narrow and high chiasm-sella were observed in 28/69 (40.5%) and 41/69 patients (59.4%), respectively. The mean distance of the chiasm-sella was 9.46± 3.76. Gross total tumor resection was achieved in 60/84 (71.4%) and subtotal tumor resection was performed in 24/84 (28.6%) patients. The results revealed that suprasellar location (OR: 0.068; p = 0.017) and recurrent cases (OR: 0.011; p<0.001) were negative predictive factors on GTR. Increasing the experience (OR: 42,504; p = 0.001) was a positive predictor factor for GTR.
Conclusion
An EETS approach that uses the infrachiasmatic corridor is required for skull base lesions extending into the suprasellar area. The infrachiasmatic corridor can determine the limitations of endoscopic craniopharyngioma surgery. This corridor is a surgical safety zone for inferior approaches.
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- MRI:
-
magnetic resonance imaging
- EETS:
-
extended endoscopic transsphenoidal surgery
- DI:
-
diabetes insipidus
- DTI:
-
diffusion tensor imaging
- FA:
-
fractional anisotropy
- MD:
-
mean diffusivity
- BAM:
-
basal arachnoid membrane
- LM:
-
Liliequist’s membrane
- DL:
-
diencephalic leaf
- ML:
-
mesencephalic leaf
- PRL:
-
prolactin
- GH:
-
growth hormone
- IGF-1:
-
insulin-like growth factor 1
- FSH:
-
follicle stimulating hormone
- LH:
-
luteinizing hormone
- TSH:
-
thyroid stimulating hormone
- FT4:
-
free thyroxine
- ACTH:
-
adrenocorticotropic hormone
- CSF:
-
cerebrospinal fluid
- OCT:
-
optical coherence tomography
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Ceylan, S., Caklili, M., Emengen, A. et al. An endoscopic endonasal approach to craniopharyngioma via the infrachiasmatic corridor: a single center experience of 84 patients. Acta Neurochir 163, 2253–2268 (2021). https://doi.org/10.1007/s00701-021-04832-0
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DOI: https://doi.org/10.1007/s00701-021-04832-0