Comparison of preoperative TN staging of gastric carcinoma by endoscopic ultrasonography with CT examination

Table 1 Relationship between endoscopic ultrasonography and anatomic layers in the normal gastric wall

EUS	Histology
1st hyperechoic layer	Water interface and superficial mucosa
2nd hypoechoic layer	Deeper mucosa
3rd hyperechoic layer	Submucosa
4th hypoechoic layer	Muscularis propria
5th hyperechoic layer	Subserosa, serosa and the interface echo

EUS: Endoscopic ultrasonography.

Table 2 TNM classification

T1	Invasion of mucosa or submucosa
T2	Invasion of muscularis propria or subserosa
T3	Invasion of serosa
T4	Invasion of adjacent structures
N0	No lymph node metastasis
N1	Metastasis in perigastric lymph node (s) within 3 cm of the edge of the tumor
N2	Metastasis in perigastric lymph node (s) > 3 cm from the edge of the primary, or in lymph node along the left gastric, common hepatic, splenic or celiac arteries
M0	No distant metastasis
M1	Distant metastasis

Table 3 Accuracy of endoscopic ultrasonography in the preoperative T staging in 62 patients with gastric carcinoma

HistopathologicalT stage	n	EUS T stage (n)				EUSaccuracy (%)	EUSoverstaging (%)	EUSunderstaging (%)
		T1	T2	T3	T4
T1	5	5	0	0	0	100.0	0.0	0.0
T2	11	0	9	2	0	81.8	18.2	0.0
T3	24	0	2	18	4	75.0	16.7	8.3
T4	22	0	0	2	20	90.9	0.0	10.0
Total	62					83.9	9.7	6.5

EUS: Endoscopic ultrasonography; T staging: Depth of invasion.

Table 4 Accuracy in the preoperative determination of the N stage in 62 patients with gastric carcinoma

Histopathological N stage	n	EUS N stage (n)			EUS accuracy (%)
		N0	N1	N2
N0	32	28	4	0	87.5
N1	18	5	13	0	72.2
N2	12	1	3	8	66.7
Total	62				79.0

EUS: Endoscopic ultrasonography; N staging: Involvement of lymph nodes.