Erdheim-Chester Disease with No Skeletal Bone Involvement and Massive Weight Loss

Figure 6

Series of FDG-PET/CT images of the abdomen and pelvis at the level of the sacrum throughout the management course. (a) Initial PET scan at the time of presentation (November 2016). (b) Progression of anterior abdominal wall involvement (arrows) and new sacral involvement (arrowhead) while on pegylated interferon (May 2017). (c) Significant interval regression of sacral and anterior abdominal wall involvement after starting vemurafenib (July 2017).