PMC9842788_01
Plain radiograph of left ankle (lateral view) showing a lytic lesion with central calcification in the calcaneum.
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A plain radiograph of the left ankle was ordered which showed a well-defined, radiolucent bone lesion of size measuring about 24 x 28 mm within the anterior part of the calcaneum, with central radiopaque area of calcification called as Cockade sign as shown in Figure 1.
Helical CT scan of left ankle (A: sagittal section and B: coronal section) showing a well-defined lytic lesion in the calcaneal neck with sclerotic margin and containing fat components and calcifications within.
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The inferior cortex of the calcaneum was thinned out without any cortical break as shown in Figure 2A,B.