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Figure 5b. (a) Screen shows the first page of the presentation for the inverted Napoleon hat sign. The anatomic group and subgroup are given at the top. The initial screen shows just the sign with no additional information or arrows. To the right is a panel of buttons with the yellow button at the top highlighted. (b) Screen shows an explanatory legend added to the previous screen. The inset image shows the inverted "hat" over the sacrum. (c) Screen shows some of the additional images that are available. These show a lateral view of the same patient with spondylolisthesis and an explanatory text, with the spinal displacement shown in green.
