The concentric ring sign is a pathognomonic sign for a subacute hematoma on MRI. A subacute hematoma may show three characteristic layers of signal intensity:
- a thin peripheral rim of low signal intensity on all pulse sequences corresponding to hemosiderin
- an inner peripheral high-signal intensity zone on T1-weighted imaging due to methemoglobin
- the central component of the hematoma has variable signal intensity based on the amounts of seroma, deoxyhemoglobin, and methemoglobin present
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