This non-contrast CT is from an elderly woman with atrial fibrillation who presented with an acute onset of left sided ataxia one month ago. The CT brain shows a hypodense lesion involving the left cerebellum 
(Figure 1). The area affected is supplied by the left posterior inferior cerebellar artery.
Subarachnoid haemorrhages are where there is an extravasation of blood into the space between the arachnoid and pia. Subarachnoid haemorrhages often develop as a result of rupture of a cerebral aneurysm (most often arising from the circle of Willis or the middle cerebral artery bifurcation) or consequent to severe head trauma. Patients with subarachnoid haemorrhage secondary to aneurysmal…
Stroke due to other determined cause Strokes due to other determined cause would include those due to carotid or vertebral artery dissection, vasculitis and thrombophilias. The first case shows the MRI (Figure 1) from a patient with a right carotid artery dissection resulting in an anterior circulation infarct. The MRI shows a clear dissection flap along the right carotid artery ….
Dr Raymond Chang
In the first video, the patient has both horizontal nystagmus and vertical “down-beat” nystagmus. In the second video, the patient has a torsional nystagmus when looking to her right hand side. Discussion of the sign Nystagmus is defined as a rhythmic oscillation of the eyes. It usually consists of a slow drifting phase in one direction and a…
The scans shown are from two immunocompromised patients who presented with high fever and recurrent seizures. The contrast cranial CT of the first patient shows that the patient had a rim-enhancing lesion at the left basal ganglia (Figure 1). A set of cranial MRIs of the second patient also showed multiple contrast enhancing lesions in the…
This is a non-contrast cranial CT from a middle-aged man with multiple cardiovascular risk factors who suffered a severe ischaemic stroke involving the left middle cerebral artery territory. There was significant cytotoxic cerebral oedema as a result of the extensive infarction. The patient was operated on by the Neurosurgeons and a left hemi-craniectomy was performed…