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Comparison of selected abnormalities with the rates found in an asymptomatic population study
| Abnormality | Current study CT in chronic daily headache (n = 4 404), % | Morris et al11 MRI in asymptomatic population (n = 19 559), % |
|---|---|---|
| Tumour | 0.5 | 0.7 |
| Chiari 1 | 0.4 | 0.24 |
| Arachnoid Cyst | 0.2 | 0.5 |
| Aneurysm | 0.1 | 0.35 |
| Cavernoma | 0.04 | 0.16 |
| Colloid Cyst | 0.04 | 0.04 |
| AVM | 0.02 | 0.05 |
AVM = Arteriovenous malformation
