Concentric ring sign

Last revised by Jeremy Jones on 15 Sep 2021

The concentric ring sign is a pathognomonic sign for a subacute haematoma on MRI. A subacute haematoma may show three 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

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