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from Section 2 - Diagnosis, Assessment, Investigation, Monitoring and Data Interpretation
Published online by Cambridge University Press: 27 July 2023
Key Learning Points
1. Delineation of the lobes on CT is more difficult than on MRI, and instead they are often referred to as ‘regions’ on CT.
2. Appreciation of the cerebrospinal fluid (CSF) spaces is useful to assess brain volume, mass effect, hydrocephalus and haemorrhage.
3. Subarachnoid haemorrhage (SAH) is commonly seen as abnormal high attenuation within the cerebral sulci, ventricles and/or the basal cisterns.
4. Subdural haematomas (SDH) appear on CT as a concave extra-axial collection (outside the brain parenchyma).
5. Extradural haematomas (EDH) appear as a convex/lens shape and usually underlie a fracture. If the haematoma extends past a suture, it is not extradural.
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