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. 2020 Oct 7;50(4):645–663. doi: 10.1007/s00256-020-03632-4

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© The Author(s) 2020

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Fig. 12 — a, b, c Benign neoplastic (osteoid osteoma). A 8-year-old male patient with pain in the end of the left thigh worsening at night. T1w imaging (a) shows a hypointense lesion with well-defined margins (arrowhead) surrounded by a slightly hypointense halo (*). STIR imaging (b) demonstrates the edematous nature of the halo (*) and well highlights the great extension of the perilesional ELMSI itself. Contrast-enhanced T1w imaging (c) shows the enhancement of the nidus (arrowhead) and the slight enhancement of the perilesional marrow signal alterations (*)