Sentinel clot sign

The sentinel clot sign is a useful CT finding for the evaluation of probable anatomic sites of haemorrhage.

On CT, acute clotted haemorrhage typically has high attenuation (45 to 80 HU), whereas surrounding areas of acute non-clotted haemorrhage or more chronic haemorrhage have either lower attenuation (25 to 45 HU) or fluid attenuation (0 to 20 HU).  

This is the basis for the sentinel clot sign, areas of higher attenuation are likely to represent more acute clotted haemorrhage, and are therefore more likely to indicate the anatomic sites of haemorrhage.

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Article information

rID: 21489
System: Vascular
Section: Signs
Synonyms or Alternate Spellings:
  • Sentinel clot
  • Sentinel clot sign in CT
  • Sentinel clot sign on CT

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