Figure 40.

Large anorectal cancer. (a) Squamous cell carcinoma of the anus (white arrow), hypermetabolic on an axial fused FDG PET-CT of the low pelvis; (b) On an axial fused FDG PET-CT image of the pelvis, tumor extends into the rectum as a bulky hypermabolic mass (white arrow); (c) In keeping with behavior of rectal tumors, anal cancer that extends significantly into the rectum is frequently associated with lung metastases, as in this case on an axial fused PET-CT of the low chest (white arrowhead).