Rectal ESD

What makes a polyp complex

Size alone is not the criterion. Difficulty comes from morphology: a flat or sessile lesion gives a snare nothing to grasp, a position behind a fold or in an angulation hides the margins, and scarring from a previous attempt tethers the mucosa to the layer beneath it.

The path that is avoided

Until recently such lesions were referred for colectomy, removal of a segment of bowel, for a finding that in the great majority proves benign. Endoscopic removal reverses that logic: the lesion is taken out completely, and surgery is reserved for the cases that genuinely require it.

When a polyp is considered complex

Size alone is not the criterion. A polyp is complex when it is flat or sessile, occupies a large part of the circumference, sits behind a fold or in an angulation, or is scarred after a previous unsuccessful attempt at removal. Such lesions were once referred for surgery and are now removed endoscopically in the great majority of cases.

After the resection

The specimen is sent for histology, and it is that report rather than the endoscopic appearance that determines the next step. Surveillance intervals are set by guideline and individualised per case; they are set out in detail on the page for colonoscopy.

Why previous attempts make it harder

A lesion that has already been approached unsuccessfully is tethered by scar tissue to the layer beneath it. Injected fluid no longer lifts it cleanly, so the plane that makes dissection safe may not open at all. Recognising that non-lifting sign before starting is part of the assessment, because it changes both the technique and the estimate of what is achievable.