Aneurysms inside the brain can be considered for removal through craniotomy, but there are some brain aneurysms that cannot be operated on. An aneurysm inside the brain is a tumor-like structure that forms when part of a brain artery protrudes outward, and is not a tumor. Most brain aneurysms do not need to be removed, but can be prevented from rupturing by cranial clamping or embolization (inserting a spring coil or other material through an arterial catheter into the aneurysm to block it). A small number of huge aneurysms, which have a space-occupying effect, can be considered for resection and decompression after clamping. It is recommended that patients with cerebral aneurysms go to the neurosurgery department for consultation, where the doctor can help them choose between different treatments such as surgical resection and interventional tamponade.