Cerebellar haemorrhage, factor XI deficiency and concomitant risk factors.

Abstract

### Learning Point for Clinicians A 36-year-old Pakistan man presented with a sudden loss of consciousness. Brain computed tomography (CT) scan demonstrated a wide cerebellar haemorrhage, without fracture of the occipital bone. Cerebral angiography showed no evidence of aneurism or arteriovenous malformations, but a focal stenosis of basilar artery, immediately after the origin of anterior–inferior cerebellar arteries (Figure 1). These findings were confirmed by CT angiography, which identified a 60–70% stenosis of the intermediate tract of basilar artery, attributable to fibromuscular dysplasia. Figure 1. ( A ) Computed tomographic images on admission demonstrated right paramedian cerebellar haemorrhage. ( B …