V entricular neuroendoscopy represents an important advance in the treatment of hydrocephalus. About 30% of patients with hydrocephalus meet the criteria for this technique, which may prevent the need for a ventriculoperitoneal shunt, resulting in reduced costs and low incidence of late complications. 4,5,6,7,12,15,17 Nonetheless, because a ventricular endoscope is used through a single bur hole, additional resources to enable cutting, coagulation, and ablation of injuries are extremely relevant to reduce surgical time and hospital length of stay, and increase the safety of the procedure and the patient's postoperative comfort. 8,10,18 Increasing experience in several centers has proven that laser-assisted endoscopic procedures are useful options, because they are safe, effective, and advantageous in cases of distorted anatomy. 4,18 We have previously shown favorable results of surgical Nd:YAG and therapeutic laser (diode 685 nm) in neuroendoscopic procedures, such as excision of colloid cysts and myelomeningocele repair. 10,11 Furthermore, the use of 980-nm diode laser in brain tissue of Wistar rats has been tested in recent studies and was associated with a remarkable ablating capacity, minimal thermal damage to surrounding tissue, and lower recovery time than other lasers with different wavelengths or electrocoagulators. The 980-nm-wavelength diode laser provides proper absorption in both water and hemoglobin, which is an adabbreviatioNs μ A (H 2 O) = absorption coefficient of water; CW = continuous wave; ETV = endoscopic third ventriculostomy. obJective Ventricular neuroendoscopy represents an important advance in the treatment of hydrocephalus. Highpower (surgical) Nd:YAG laser and low-level laser therapy (using 685-nm-wavelength diode laser) have been used in conjunction with neuroendoscopy with favorable results. This study evaluated the use of surgical 980-nm-wavelength diode laser for the neuroendoscopic treatment of ventricular diseases. methods Nine patients underwent a neuroendoscopic procedure with 980-nm diode laser. Complications and followup were recorded. results Three in-hospital postoperative complications were recorded (1 intraventricular hemorrhage and 2 meningitis cases). The remaining 6 patients had symptom improvement after endoscopic surgery and were discharged from the hospital within 24-48 hours after surgery. Patients were followed for an average of 14 months: 1 patient developed meningitis and another died suddenly at home. The other patients did well and were asymptomatic until the last follow-up consultation. coNclusioNs The 980-nm diode laser is considered an important therapeutic tool for endoscopic neurological surgeries. This study showed its application in different ventricular diseases.