Whether the skull can be put back after craniotomy depends on the condition of the disease. If the cranial bone is put back for the purpose of surgical decompression, it cannot be put back because the cranial bone will not achieve the effect of treatment after being put back, and it is likely to cause the increase of intracranial pressure again, and it is likely to take out the cranial bone again in the process of subsequent treatment. Decompression of severe craniosynostosis is one way of treatment, and the skull is not returned. For brain tumor removal, if the swelling of brain tissue is not obvious and the intracranial pressure is not high, the cranial bone can be put back, so whether the cranial bone can be put back after craniotomy is mainly based on its specific condition. For some patients who have their skull bone returned after craniotomy, dynamic review of head CT is necessary after surgery to assess whether intracranial hypertension has occurred, and if intracranial hypertension has occurred, the returned bone flap may need to be removed again.