Flexible Fiber CO Laser in Microsurgical Treatment of Intraventricular Tumors: Usefulness and Limitations.

Objective: To assess usefulness and limitations of flexible fiber carbon dioxide (CO) laser in the microsurgical treatment of intraventricular tumors.

Methods: We reviewed a series of 9 patients treated with microsurgical resection of intraventricular tumors using a flexible fiber CO laser. The lesions involved the third ventricle (8) and the frontal horn of the right lateral ventricle (1). Histology revealed 6 craniopharyngiomas, 1 pituitary macroadenoma, 1 subependymoma, and 1 neurocytoma. In all cases, an interhemispheric transcallosal approach was performed. The laser was used during callosotomy, fornix column sectioning, tumor debulking, and to facilitate tumor dissection. We used a 5-tiered score system to assess laser's efficacy in each surgical step (approach, dissection, debulking): grade 1: laser was not at all helpful, grade 5: laser was extremely helpful. Limits of the instrument also are discussed.

Results: Gross total resection was achieved in 6 cases and subtotal resection in the remaining 3. Three patients had pulmonary complications treated without clinical sequelae. No laser-related complication was described. Mean utility score observed was 4.2 (range 3-5) during approach, 2.8 (range 2-4) during tumor dissection; and 3.3 (range 2-5) during tumor debulking. Main limits were low hemostatic effect and inefficiency versus calcified and highly vascularized tumors.

Conclusions: The CO laser proved to be a useful and safe tool that could be used for intraventricular pathology; its design is suitable for narrow surgical corridors like interhemispheric fissure and foramen of Monro; its main utility is the ability to create precise and relatively bloodless cut (callosotomy, tumor debulking); low hemostatic effect is its main limit.