What are the causes of cranial defects? In the current state of many people in some kind of reason, resulting in cranial defects, such a situation caused by the appearance of shortcomings, then you have to choose cranial repair, the following neurosurgery experts to introduce in detail the etiology of cranial defects. Cranial defect can be seen in: 1, open cranial injury, especially after firearm injury for debridement, the skull itself is fracture, fracture, the wound is a bacterial open wound, easy infection, fracture can not be reset. 2, closed craniocerebral injury to remove the hematoma, contusion of inactivated brain tissue after the intracranial pressure is still high, and to perform decompression of the bone flap. 3.Osteoma and other cranial bone lesions after resection. Cranial bone is membranous bone with poor regenerative ability, and new bone mainly comes from the inner periosteum, and the bone regeneration ability is lost after 5-6 years old. Those with a diameter of less than 1cm can heal bony, but those with a diameter of 2-3cm or more are difficult to repair, thus leaving a cranial defect. Usually skull defect less than 3cm is asymptomatic; after temporal muscle decompression or suboccipital decompression, there are thick muscles and fascia covering and a tough fibrous healing layer can be formed in the defect area, which can play the role of the original skull to protect the brain, and there is no symptom in the clinic. Large skull loss can cause serious deformation of the patient’s head, directly affecting the physiological balance of intracranial pressure, collapsing when upright, expanding when lying down, concave in the morning and convex at night; or because the atmospheric pressure acts directly on the brain tissue through the defect area, which will inevitably lead to local brain atrophy and aggravate the symptoms of brain wasting over time, and at the same time, the affected ventricle will gradually expand and expand or deform to the defect area. In addition, the cranial defect of children can become larger with the development of brain tissue, the edge of the defect turns outward, and the protruding brain tissue gradually shows progressive atrophy and cystic changes, so children need a complete cranium to ensure normal brain development.