Depressed-Type Colonic Lesions and “De Novo” Cancer in Familial Adenomatous Polyposis: A Colonoscopist’s Viewpoint

Table 1

The invasive rates according to morphology.

Invasive rate according to size distribution
Size (mm)	–5	6–10	11–15	16–20	21–	Total
Depressed	6/56; (10.7%)	40/76; (52.6%)	60/65; (92.3%)	34/34; (100%)	19/21; (90.4%)	159/252; (63.1%)
Flat	0/3561; (0%)	19/1353; (1.4%)	39/524; (7.4%)	48/364; (13.2%)	144/796; (18.0%)	250/6598; (3.8%)
Protruded	1/4167; (0.02%)	63/4310; (1.4%)	105/1066; (9.8)	91/490; (18.5%)	91/408; (22.3%)	351/10441; (3.3%)

April 2001 to March 2012.