Initial colonoscopy at the referring hospital. a,b The lower rectal lesion was classified as IIa + IIc, 10 mm in size. The depressed area has a remarkable reddish surface with fold convergence. c. Magnifying chromoendoscopy with indigo carmine (0.4%) demonstrates the surface character and margins of the depressed area. d. Magnifying chromoendoscopy with crystal violet (0.05%) revealed Kudo’s type IIIL or VI mildly irregular pit pattern (non-invasive pattern in our clinical classification).
Nakamura et al. BMC Gastroenterology 2013 13:146 doi:10.1186/1471-230X-13-146