Subarachnoid haemorrhage (SAH)

Hover on/off image to show/hide findings

Tap on/off image to show/hide findings

Subarachnoid haemorrhage (SAH)

  • Dense material in the basal cisterns and fissures is due to acute bleeding into the subarachnoid space
  • Blood in the subarachnoid space can fill or partly fill the sulci, fissures, basal cisterns and ventricles

Clinical information

  • (All 3 images on this page)
  • Sudden onset of severe - 'worst ever' - headache

Subarachnoid haemorrhage (SAH)

Hover on/off image to show/hide findings

Tap on/off image to show/hide findings

Subarachnoid haemorrhage (SAH)

  • Occasionally blood is seen layered over the tentorium which appears denser than is normally seen

Subarachnoid haemorrhage (SAH)

Hover on/off image to show/hide findings

Tap on/off image to show/hide findings

Subarachnoid haemorrhage (SAH)

  • Blood in the ventricles may be the only sign of subarachnoid haemorrhage
  • When a CT scan is acquired the patient lies supine and any blood in the lateral ventricles will collect posteriorly
  • Calcification of the choroid plexus is a normal finding which should not be mistaken for intraventricular blood