Endosonographic surveillance of 1-3 cm gastric submucosal tumors originating from muscularis propria

Table 4 Comparison of basic characteristics and endoscopic ultrasound findings between patients with gastrointestinal stromal tumors and leiomyomas by the Mann -Whitney U test

Basic characteristic or EUS finding	GIST n = 13	Leiomyoma n = 4	P value
Age (median, range, yr)	57 (41-70)	58 (50-69)	0.785
Sex (M/F)	4/9	2/2	0.482
Location			0.868
Cardia	2	1
Fundus	4	1
Body	6	1
Antrum	1	1
EUS tumor size and echotexture
Initial tumor size (median, mm)	21	11.5	0.015
Final tumor size (median, mm )	28	11.5	0.003
Homogeneous/heterogeneous hypoechoicity	4/9	2/2	0.482
Smooth/ irregular tumor border	5/8	0/4	0.682
With/without internal cystic change or calcification	1/12	0/4	0.567
EUS surveillance
Surveillance duration (median, range, mo)	31.3 (3.1-81.0)	3.6 (3.0-21.4)	0.023
Surveillance procedure (median, range, times)	3 (2-8)	2 (2-3)	0.163
Tumor progression	13	0	< 0.001

GISTs: Gastrointestinal stromal tumors; EUS: Endoscopic ultrasound.