Preoperative diagnosis of gastrointestinal stromal tumor by endoscopic ultrasound-guided fine needle aspiration

Table 1 Clinicopathological characteristics (n = 53)

Anatomic sites of the lesions
	Esophagus	n = 4	Stomach	n = 43
	Duodenum	n = 1	Rectum:	n = 4
	Pancreas	n = 1
Final diagnosis after EUS-FNA
Surgically resected cases (n = 32)
	GIST:	n = 27	Leiomyoma:	n = 1
	Neurinoma:	n = 2	Accessory spleen:1	n = 1
	Esophageal cancer:	n = 1
Not surgically rsected cases (n = 21)
	GIST:	n = 6	Ectopic pancreas:	n = 2
	Recurrence of rectal cancer:	n = 2	Neurinoma:	n = 1
	Leiomyoma:	n = 1	Pancreatic cancer:	n = 1
	Not diagnostic:	n = 8

¹Laparotomic biopsy only.

Table 2 Technical results of EUS-FNA (n = 53)

Puncture not performed	12/53 (4%)
Puncture success rate	51/51 (100%)
Number of EUS-FNA passes	1 to 6 passes (Average, 2.4)
Collection of adequate specimen	42/51 (82%)
Complications	0/53 (0%)

¹Reason: 1 intervening vessel, 1 tumor location.

Table 3 Diagnostic rate according to tumor size

Tumor size (mean)	Diagnostic rate (%)
0-2 cm (1.5)	15/21 (71)
2-4 cm (3.3)	18/21 (86)
4- cm (6.6)	9/9 (100)
Total (3.0)	42/51 (82)

Table 4 Diagnosis of GIST or non-GIST using immunohisto-chemical analysis in the 29 surgically resected cases

Surgery	EUS-FNA
	GIST	Non-GIST
GIST	24	0
Non-GIST	1	4

Overall accuracy 97% (28 of 29); sensitivity 100% (24 of 24); specificity 80% (4 of 5); positive predictive value 96% (24 of 25); negative predictive value 100% (4 of 4).