Patient details and presenting symptoms
| No. | Age (yr) | Sex | Clinical Presentation | Initial CT/MR |
|---|---|---|---|---|
| 1 | 45 | M | Collapse, headache | CT/CTA: ICH posterior fossa, developing hydrocephalus |
| 2 | 64 | M | Unrelated stroke, incidental finding on imaging | CT/CTA: small subacute ischemic area supratentorially, dilated abnormal vessels in the posterior fossa |
| 3 | 56 | M | Collapse, vomiting, dysarthria, blurred vision | CT/CTA: ICH posterior fossa, developing hydrocephalus |
| 4 | 65 | F | Transient arm weakness | MRI: abnormal vessels with venous engorgement |
| 5 | 65 | M | Acute-onset headache | CT/CTA: SAH in the posterior fossa with ventricular spread, hydrocephalus |
| 6 | 64 | F | Hearing loss, tinnitus, diplopia | MRI: abnormal vascular structures in the right-side posterior fossa |
| 7 | 64 | F | Headache, progressive mental confusion, dysphasia | CT/CTV: engorged leptomeningeal veins |
| 8 | 66 | M | Visual disturbance and hemianopia | MRI: multiple congested intracranial veins |
| 9 | 58 | M | Acute-onset headache | CT/CTA: posterior fossa SAH |
| 10 | 60 | F | Severe headache, vertigo | CT/CTA: perimesencephalic SAH |
| 11 | 64 | M | Collapse, vomiting, aphasia | CT: posterior fossa SAH with intraventricular spread |
| 12 | 56 | F | Pulsatile tinnitus | MRI/MRA: abnormal vessels |
| 13 | 60 | M | Acute-onset headache | CT: cerebellar ICH |
Note:—CTV indicates venous phase CTA.