Table 3.
Number and percentage of reportable MRI abnormalities by type and sex
| All (N=471) | Male (N=241) | Female (N=230) | ||||
| n | % (95% CI) | n | % (95% CI) | n | % (95% CI) | |
| Any abnormality | 21 | 4.5 (2.8 to 6.7) | 6 | 2.5 (0.9 to 5.3) | 15 | 6.5 (3.7 to 10.5) |
| Acute brain infarction | – | – | – | – | – | – |
| Acute brain haemorrhage | – | – | – | – | – | – |
| Suspected intracranial mass lesion | 7 | 1.5 (0.6 to 3.0) | 2 | 0.8 (0.1 to 3.0) | 5 | 2.2 (0.7 to 5.0) |
| Suspected intracranial aneurysm or vascular malformation | 9 | 1.9 (0.9 to 3.6) | 2 | 0.8 (0.1 to 3.0) | 7 | 3.0 (1.2 to 6.2) |
| Colloid cyst of the third ventricle | – | – | – | – | – | – |
| Acute hydrocephalus | – | – | – | – | – | – |
| Significant sinus pathology | 3 | 0.6 (0.1 to 1.9) | 1 | 0.4 (0.0 to 2.3) | 2 | 0.9 (0.1 to 3.1) |
| Other* | 2 | 0.4 (0.0 to 1.5) | 1 | 0.4 (0.0 to 2.3) | 1 | 0.4 (0.0 to 2.4) |
*Possible keratocystic odontogenic tumour of the right mandible (n=1); hyperintense area in the suprasellar cistern with differential diagnosis of small dermoid cyst, craniopharyngioma or thrombosed anterior communicating artery aneurysm (n=1).