Perform a prospective cohort study to compare the incidence and severity of headache between non-stent assisted coiling and stent assisted coiling of unruptured intracranial aneurysms.

severity of headache - assess with visual analogue scale characteristics of headache after stent deployment or simple coiling Duration of headache after intervention

Inclusion Criteria:

• patients with unruptured intracranial aneurysms
• patients over 20 years old
• patients who can communicate with each other
• patients who agreed to this study (with informed consent)

Exclusion Criteria:

• patients with recurrent aneurysms after coiling or clipping
• patients with allergic reaction to antiplatelets
• patients with high risks of hemorrhage
• patients with coagulopathy
• patients with thrombocytopenia (<100,000/mm3)
• patients with liver disease (> 100 of aspartate aminotransferase or alanine aminotransferase)
• patients with renal disease (> 2mg/dL of serum creatinine)\
• patients with uncontrolled heart failure or angina
• patients with malignant tumor
• pregnant patients
• patients with past history that may associated with headache, including subarachnoid hemorrhage, head trauma, intracerebral hemorrhage, trigeminal neuralgia, arteriovenous malformation, brain tumor)
• Patients who are determined to be disqualified by researchers