Cranial defects are partly due to open craniocerebral trauma or firearm penetrating injuries, and partly due to surgical decompression, penetrating destruction due to craniosynostosis, or removal of cranial lesions. So, what are the symptoms of cranial defects? What are the symptoms of cranial bone defects are introduced below. 1, asymptomatic Smaller than 3cm cranial defects and cranial defects located under the temporal and occipital muscles are mostly asymptomatic. 2.Osteosclerosis The range of cranial defects caused by growth fracture in children is expanding, and osteosclerosis is formed around the periphery of the defect. 3.Brain swelling and neurological signs In the early stage of cranial defects, due to severe cerebral edema, the dura mater of the brain tissue and cranial defects form myxoid swelling, and embedded in the bone edge, resulting in local ischemia and necrosis causing a series of neurological signs and symptoms. Cranial defect syndrome: Headache, dizziness, nausea, loss of limb muscle strength, fear of cold, fear of vibration, inattention and other mental symptoms caused by larger cranial defects.