Concentric ring sign

The concentric ring sign is a pathognomonic sign for a subacute haematoma on MRI.

A subacute haematoma may show 3 characteristic layers of signal intensity:

  • a thin peripheral rim of low signal intensity on all pulse sequences corresponding to haemosiderin.
  • an inner peripheral high-signal intensity zone on T1-weighted imaging due to methaemoglobin.  
  • the central component of the haematoma has variable signal intensity based on the amounts of seroma, deoxyhaemoglobin, and methaemoglobin present.
Share article

Article information

rID: 21490
System: Vascular
Section: Signs
Tag: refs, cases, sign
Synonyms or Alternate Spellings:
  • Target sign of haematoma on MRI
  • Concentric ring sign on MRI

Support Radiopaedia and see fewer ads

Updating… Please wait.

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.