Clinical information: MIHGRAINE OFF AND ON FOR 3 YEARS+ Technique for examination: CT scan of brain without contrast injection was performed. The reconstructed thickness was 5 mm in axial and coronal images. Soft tissue window was displayed for evaluation. Findings: 1. No significant evidence of abnormal density or mass effect over brain parenchyma can be detected. 2. No definite intracranial hemorrhage or hydrocephalus can be noted. 3. No obvious skull vault fracture can be noted. Impressions: No significant abnormal findings. Please follow up.