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2.9 - Imaging of the Head
from Section 2 - Diagnosis, Assessment, Investigation, Monitoring and Data Interpretation
- By Chun Wah So, Matthew Gale
Edited by Ned Gilbert-Kawai, The Royal Liverpool Hospital, Debashish Dutta, Princess Alexandra Hospital NHS Trust, Harlow, Carl Waldmann, Royal Berkshire Hospital, Reading
Book:

Intensive Care Medicine

Published online:

27 July 2023

Print publication:

01 December 2021, pp 61-67
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Summary

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.