FIGURE 2.

A 52-year-old man with desmoid-type fibromatosis in the chest wall without recurrence (Group 2). This was misdiagnosed as a neurogenic tumor based on preoperative CT but as fibromatosis based on preoperative MR. Axial pre- (A) and contrast-enhanced (B) CT axial images (5-mm reconstruction) show a circumscribed, well-defined mass (^∗) without enhancement in the right chest wall. Note the osteoblastic change of the rib (arrow). FDG PET reveals a hypometabolic mass, with a maximal standardized uptake value of 2.3 (not shown). (C) A mass shows abutting the rib (^∗) with no evidence of invasion of the cortex of bone and periosteum (arrows, ×40 magnification). CT = computed tomography, MR = magnetic resonance, FDG PET = ¹⁸F-fluorodeoxy glucose positron emission tomography.