Would you consider sentinel lymph nodes in a patient with a history of radiation for rectal cancer (no surgery) now with newly diagnosed endometrial cancer?  

I do not perform sentinel node biopsy for patients who have undergone radiation for rectal cancer. The radiation field for rectal cancer usually includes the tumor plus a 2-5 cm margin. The presacral nodes and internal iliac nodes may also be included. (Kye and Cho, PMID 25210685)Radiation may also ...