The penumbra sign in subacute osteomyelitis.

Davies, A M; Grimer, Robert · Eur Radiol · 2005

review · Level V

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Abstract

The penumbra sign is a characteristic magnetic resonance (MR) feature of subacute osteomyelitis. It can be identified on unenhanced T1-weighted spin echo images as a discrete peripheral zone of marginally higher signal intensity than the central bony abscess cavity and the surrounding lower signal intensity of the reactive new bone and oedema.

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