Modality: CT
Axial non-contrast
Modality: CT (non-contrast)

- “ Perimesencephalic haemorrhage is a distinct type of subarachnoid haemorrhage confined to the basal cisterns around the midbrain (typically the int...”

Used in the following articles:

  • Subarachnoid haemorrhage - “ Subarachnoid haemorrhage (SAH) is one of the types of extra-axial intracranial haemorrhage and denotes the presence of blood within the subarachno...”
  • Perimesencephalic subarachnoid haemorrhage - “ Perimesencephalic subarachnoid haemorrhage (PMSAH) is a distinct pattern of subarachnoid haemorrhage (SAH), which is centred on the basal cisterns...”
  • Thunderclap headache - “ A thunderclap headache is a very sudden onset headache, and often described as being hit in the head with a baseball bat (cricket bat etc... presu...”

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