Abstract
Background
The transsphenoidal approach has recently been used to treat complex lesions beyond the sella turcica, but the difficulties of dealing with small vessels, deep and narrow space, and working angle may limit the procedures. To overcome these problems, we have developed a pulsed laser-induced liquid jet (LILJ) system to dissect tumor tissue with preservation of fine blood vessels within deep and narrow working spaces and evaluated its utility and safety.
Methods
The LILJ system was applied to 14 consecutive patients with uncharacteristically complex skull base tumor treated through the extended transsphenoidal approach. This system consists of a bayonet-shaped catheter incorporating a jet generator formed of stainless tube (external diameter 1.10 mm, internal diameter 0.78 mm), which was surrounded by a coaxial polytetrafluoroethylene 14-G equivalent suction tube to be able to incorporate into the confined working spaces. Minor modifications could be fitted for the catheter (15 to 18 cm length, straight or side flexion tip), and total weight was around 7 g.
Findings
Precise dissection and mass reduction of the tumor were obtained in all cases except one recurrent case of chordoma with significant fibrosis due to radiation. Both small arteries and veins were preserved, allowing subsequent microsurgical devascularization. Intraoperative blood loss was minimal, and tumor removal rate was satisfactory after the introduction of the system. No complication was related to use of the LILJ system.
Conclusion
Although comparison between conventional surgical instruments is mandatory in the future, the present study suggests that the LILJ system can achieve safe and optimum removal of complex skull base tumor. Potential application for minimally invasive endoscopic system, as well as potentials for changing the design of the catheter in according to preference of surgeon with low cost, may give advantages over conventional surgical instruments.
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Acknowledgment
This work was supported in part by a Grant-in-Aid for Scientific Research (B) (No. 18390388 and No. 19390372), a Grant-in-Aid for Young Scientists (A) (No. 19689028 and 22689039), and Challenging Exploratory Research (Nos. 21659313 and 21659334) from the Japanese Ministry of Education, Culture, Sports, Science, and Technology, the Japanese Foundation for Research and Promotion of Endoscopy Grant, the Tohoku University Exploratory Research Program for Young Scientists (ERYs), the Collaborative Research Project of the Institute of Fluid Science, Tohoku University, and Ogino Research Facilitating award from Japanese Society of Biomedical Engineering.
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The authors describe their experience with the pulsed laser-induced liquid jet (LILJ) system in 14 patients with sellar/parasellar lesions removed via the extended transsphenoidal approach. This is a very interesting device that merits further study. This technology may be an advantage for removing tumour lateral to the carotid from the transsphenoidal approach, as those with cavernous sinus invasion. It may be optimally adjusted to be able to remove tumour while avoiding injury to the carotid or adjacent cranial nerves. This reviewer does note that the operative time was very long in some cases (over 10 h in one case). This seems excessive for an extended transsphenoidal surgery, in which the approach time is very short. One would question whether the actual removal of tumour is slow with this technique when compared with conventional instrument tumour removal.
W.T. Couldwell
Utah, USA
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Ogawa, Y., Nakagawa, A., Takayama, K. et al. Pulsed laser-induced liquid jet for skull base tumor removal with vascular preservation through the transsphenoidal approach: a clinical investigation. Acta Neurochir 153, 823–830 (2011). https://doi.org/10.1007/s00701-010-0925-x
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DOI: https://doi.org/10.1007/s00701-010-0925-x