For obstructive hydrocephalus (including hydrocephalus caused by any lesion between the posterior part of the three ventricles and the exit of the four ventricles) is the best indication for triventricular fundoplication, and the ventricular fluid can flow directly into the cerebral arachnoid pool after triventricular fundoplication, which is therefore more physiological than extracranial cerebrospinal fluid shunts. Comparison with ventriculoperitoneal shunt: 1. There is no foreign body implanted in triventriculostomy, which reduces the complications of extracranial shunt such as intracranial and abdominal infections caused by shunt implantation, shunt blockage and shunt failure due to shunt dislodgement and intestinal complications due to change of body shape. 2.With tricerebroventricular fistula, the cerebrospinal fluid in the ventricles can flow directly into the interpeduncular pool and enter the subarachnoid space of the brain and spinal cord for absorption after surgery, which is more in line with the normal physiological state of cerebrospinal fluid circulation than extracranial cerebrospinal fluid shunt (the secretion and absorption of cerebrospinal fluid in patients with obstructive hydrocephalus is balanced) and can effectively maintain the normal intracranial pressure balance and the physiological function of cerebrospinal fluid. 3.The flow rate of cerebrospinal fluid in triple ventriculostomy is uniform, and there will be no fluctuation of the shunt speed caused by the shunt siphoning with the change of body position, and no excessive drainage of cerebrospinal fluid, which can cause hypocranial pressure or even intracranial hemorrhage due to excessive loss of cerebrospinal fluid caused by ventriculoperitoneal shunt. 4. It is not affected by the growth and development of children, and avoids the pain of multiple tube replacement surgery. (The above four points are the problems that the extracranial shunt device for hydrocephalus has tried to solve since its development but still cannot overcome so far.) 5.The operation is relatively simple and the operation time is short (generally about 40min). 6. Endoscopic surgery causes less damage to the patient, short postoperative recovery time, shortens hospitalization time and reduces costs, and also reduces the rejection and mental burden caused by foreign body implantation in ventriculoperitoneal shunts. The patient was a 7-month-old male infant who was admitted to the hospital because of a gradual increase in head circumference for 7 months. On admission, the child was mentally depressed, with a 45-cm head circumference, bulging fontanelle, and high tone. Preoperative CT and MR showed enlargement of the ventricles above the third ventricle, disappearance of the cerebral sulcus and lateral fissure pool, marked interstitial edema around the lateral ventricles, and no intracranial occupancy, which confirmed the diagnosis of congenital obstructive hydrocephalus and excluded hydrocephalus caused by intracranial tumor. After the follow-up of nearly half a year after the operation, the child was lively, with a head circumference of 44.5 cm, a flat fontanelle, and low tension. Multiple CT reviews showed that the ventricles above the three ventricles were gradually becoming smaller, the cerebral gyrus and lateral fissure pool were obvious, and the interstitial edema around the lateral ventricles disappeared significantly. Preoperative CT showed enlargement of the ventricles above the three ventricles, disappearance of the sulcus and lateral fissure pool, and marked interstitial edema around the lateral ventricles. 2. T2 image of preoperative MR showed enlargement of the ventricles above the three ventricles, disappearance of the sulcus and lateral fissure pool, and marked interstitial edema around the lateral ventricles. 3. 4. Neuroendoscopic lateral ventricles: the red one is the choroid plexus, the left one is the septal vein, the right one is the thalamic vein, and the anterior one is the interventricular foramen. 5. Neuroendoscopic dilated balloon catheter fistula: the bilateral white reflective ones are the papillae, and the anterior one is the base of the three ventricles. 6. needle bipolar electrocoagulation to enlarge the fistula. 7. 3 months after surgery, CT showed that the ventricles above the three ventricles were smaller, the sulci and lateral fissure pools were obvious, and the peri-lateral ventricles interstitial edema disappeared significantly