Table 2.

Causes of radical resection after colonoscopic polypectomy

Causes	N (=22)
Involved or closed resection margin	10 (45.5 %)
Patient wanted (Sm1 or Sm2)	4 (18.2 %)
No identification of tumor depth, lymphovascular invasion, or resection margin	3 (13.7 %)
Lymphatic invasion (+)	2 (9.1 %)
No lifting of tumor at trial for polypectomy	1 (4.5 %)
Piecemeal resection	1 (4.5 %)
Sessile polyp c rectal invasive carcinoma	1 (4.5 %)