What target volumes do you use for rectosigmoid/very superior rectal cancers?

The simple answer is that there should be a major alteration in treatment volumes in these patients, as there should be NO target volume as most of these patients with very high rectal/rectosigmoid tumors do not need to be irradiated at all. If one looks at failure patterns, the risk of local failur...

I agree with @Dr. First Last's answer. The one case where we usually treat in this context is very long tumors where the tumor is above and below the peritoneal reflection. I ask the surgeon if a mesorectal dissection will be performed, and, if so, I think it is reasonable to treat the mesorectum. I...