Figure 1.

Gastric wall. Gastric wall has 5 sonomorphologic layers. (1) Hyperechoic layer, the reflected boundary echo of the epithelial surface and epithelial layer; (2) hypoechoic layer, lamina propria (LPM) of the mucosa (with glands); (3), hyperechoic, slightly wider, corresponds to the submucosa (SM) layer and includes upfront the echo from the muscularis mucosa (MM); layer (4–6) broader hypoechoic corresponds to the proper muscle (PM) layer; and the fifth (7), to the subserosa and peritoneal serosa. EUS-MP separately resolves seven layers separating the circular (4) and longitudinal (6) PM layer, adding the hyperechoic interstitial fascia between them (5)