data are required which assess accurately the risk of an invasive carcinoma being present or developing when epithelium indefinite for dysplasia , low grade dysplasia or high grade dysplasia are present both with and without an endoscopic abnormality being the source of the biopsy , and when such biopsies are obtained at the first or at subsequent colonoscopies .
C1334274
invasive
C0014609
epithelium