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FIGURE 5. PET contour extending outside CT-defined contour (patient 2). CT (A) and corresponding ¹⁸F-FDG PET image (B). PET definition of right side node (blue contour) extends beyond CT-defined node (green contour) to include other soft tissue. CT-defined GTV (central red contour) shows no corresponding PET uptake in this region at this slice level.

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