Neuroimaging is not necessary in patients with a clinical diagnosis of migraine. Head images such CT and MRI might be needed to rule out other suspected possible causes of headache. It is suggested to order a CT scan without contrast among patients with an unusual headache. MRI is indicated when there is suspicion of posterior fossa lesions and cerebrospinal fluid (CSF) leak. Magnetic resonance angiography (MRA) and magnetic resonance venography (MRV) are indicated in arterial or venous lesions.