Table 1. Clinicopathological characteristics of lesions.

Number of lesions		110
[Number of patients]		[101]
Sex	Male	76 (75.2%)
	Female	25 (24.8%)
Median age (range)		65 (34–84) years
Median tumor diameter (range)		8.0 (1–50) mm
Tumor site in duodenum	1: Superior part	22 (20.0%)
	2: Descending part	71 (64.5%)
	3: Horizontal part	11 (10.0%)
	4: Ascending part	6 (5.5%)
Macroscopic appearance	Protruding	30 (27.3%)
	Flat	65 (59.1%)
	Depressed	15 (13.6%)
Histological atypia	LGIN	44 (40.0%)
	HGIN	59 (53.6%)
	IC	7 (6.4%)

LGIN: Low-grade intraepithelial neoplasia, HGIN: High-grade intraepithelial neoplasia, IC: Intramucosal carcinoma