FIGURE 1. Example of software fusion of ¹⁸F-FDG PET and CT images for lesion localization. (A) ¹⁸F-FDG PET clearly showed pathologic lesion somewhere in upper thoracic aperture. More precise localization was not possible because of lack of anatomic information. (B) Lesion was not found retrospectively on diagnostic CT images. (C) Image fusion localized lesion in rib near costovertebral joint.