Figure 2. Non-enhanced T1-weighted MR images of the left proximal tibia in coronal (a) and sagittal (b) planes: They show a well-defined hypointense intramedullary lesion in the proximal metaphysis of the tibia with a surrounding rim of high signal intensity (¡®penumbra sign¡¯). There is extensive surrounding hypointensity representing marrow edema

From

The "Penumbra Sign" on Magnetic Resonance Images of Brodie's Abscess: A Case Report and Literature Review

Farate A, Yunusa GH, Umar UH, Ahmadu MS, Mustapha Z, Ahidjo A

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