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Double line sign

The double line sign is an MRI finding seen at the periphery of a region of osteonecrosis (avascular necrosis, bone infarct). It is best seen on T2 weighted sequences and consists of an inner bright T2 line representing granulation tissue and an outer dark line representing sclerotic bone. This sign is reported in up to 80% of cases 3.

It should not be confused with the rim sign demarcating an osteochondral fragement with surrounding fluid (indicating that it is potentially unstable).

See also

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