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. 2017 May 11;101(1):24. doi: 10.5334/jbr-btr.1300

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Copyright: © 2017 The Author(s)

This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC-BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See http://creativecommons.org/licenses/by/4.0/.

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Typical Brodie abscess in subacute osteomyelitis of the tibia. Plain radiograph (a) Schematic drawing (b) Axial T1–WI (c) and coronal Fat–Sat T2–WI (d) Plain radiograph (a) shows a focal area of metaphyseal osteolysis with a peripheral rim of reactive sclerosis (black arrows). (b) shows a the different layers of Brodie abscess on T1–WI with a the pathognomonic penumbra sign on axial T1–WI (c) and a pus-filled collection on coronal Fat–Sat T2–WI (d). Central pus of intermediate to low SI on T1–WI (white asterisks on c) and high SI on T2–WI (black asterisks on d). Internal abscess wall consisting of granulation tissue of high SI on T1–WI (penumbra sign) (white small arrow on c) and intermediate SI on T2–WI. External ring of reactional sclerosis of low SI on both T1–WI (white large arrow on c) and T2–WI. Peripheral bone marrow edema of intermediate to low SI on T1–WI and high SI on T2–WI (black arrowheads on d).