What is the appropriate monitoring for an incidental low-grade rectal neuroendocrine tumor resected endoscopically with positive margins?  

Do we have information on the size of the lesion? Typically, if it was a positive biopsy and the size of the polyp was <1 cm, we typically rescope and biopsy the scar. It can harbor residual disease (40% incidence), which a deeper resection can cure. And then these patients don't need surveillanc...