Recent advances in endoscopic management of gastric neoplasms

Table 1 Endoscopic ultrasonography features of subepithelial tumors

Subepithelial tumor	Endoscopic ultrasound layer	Histological layer	Echogenicity	Shape	Other features
Gastrointestinal stromal tumor	4th	Muscularis propria	Hypo	Irregular or round	Heterogenous, marginal halo, cystic spaces, lymphadenopathy
Leiomyoma	2nd or 4th	Deep mucosa or muscularis propria	Hypo	Round	Homogenous, fine margins
Neuroendocrine tumor (carcinoid)	2nd	Deep mucosa	Hypo or iso	Round, sessile or polypoid	Erythematous depression or ulceration, smooth margin
Lipoma	3rd	Submucosa	Hyper	Round	Homogenous
Schwannoma	4th	Muscularis propria	Hypo	Round	Heterogenous, exophytic
Granular cell tumor	2nd	Deep mucosa	Hypo	Round	Homogenous, fine margins
Inflammatory fibroid polyp	2nd	Deep mucosa	Hypo	Irregular	Heterogenous, diffuse margins
Ectopic pancreas	2nd, 3rd or 4th	Depending on layer	Mixed	Irregular	Ductal structure, anechoic microcysts