Endoscopic ultrasound features of gastric schwannomas with radiological correlation: A case series report

Table 1 Clinicopathological features of the patients

Case	Age (yr)	Sex	Size (cm)	Clinical Presentation	Site (gastric body)	Management	Outcome (mo)
1	32	Female	3.3 × 4.0	Ructus, bloating, epigastric pain	Greater curvature	Laparoscopic wedge resection	14
2	39	Female	4.9 × 4.0	Weight loss	Lesser curvature	Laparoscopic wedge resection	4
3	50	Female	8.1 × 5.3	Melena, hematemesis (GI bleeding)	Great curvature	Subtotal gastrectomy	5
4	49	Female	5.0 × 3.5	Incidental on ultrasonic examination for hysteromyoma follow-up	Lesser curvature	Subtotal gastrectomy	39

Table 2 Endosonographic findings of schwannomas

Case	Echogenicity	Ulcer	Shape	Margin	Lob	Halo	Cyst	Spots	Cal	Growth
1	Low	-	Oval	Regular	-	+	-	+	-	In < out
2	Low	-	Oval	Regular	-	+	-	+	-	In < out
3	Low	2	Oval	Regular	-	-	-	+	-	In < out
4	Low	-	Oval	Regular	-	-	-	+	-	In < out

Lob: Lobulation; Halo: Marginal halo; Cyst: Internal cystic lesion; Spots: High spots; Cal: Calcified lesion.

Table 3 Endoscopic ultrasound for differential diagnosis of gastric schwannomas versus gastric gastrointestinal stromal tumors

	Gastric schwannomas	Low-risk GIST	High-risk GIST
Echogenicity	Heterogeneous and hypoechoic, but slightly higher than that of muscularis propria	Homogeneous and hypoechoic	Heterogeneous and hypoechoic
Halo	Frequent	Uncertain	Uncertain
Growth	In < out (mostly)	In ≥ out (mostly)	Variety
Margin	Regular	Regular	Irregular
Lobulation	Rare	Uncommon	Common
High echo spot	Common	Occasional	Common
Cyst	Very rare	Frequent	Very frequent
Calcification	Scarce	Occasional	Occasional

GIST: Gastrointestinal stromal tumors.