Over-the-Scope Clip-Associated Endoscopic Muscular Dissection for Seven Cases of Small Gastric Submucosal Tumor: A Video-Based Case Series

Figure 1

Procedure of OTSC-associated endoscopic muscular dissection for the dissection of small gastric submucosal tumor. (a) A small gastric submucosal tumor of fundus; (b) the tumor was completely absorbed into the transparent cap of OTSC apparatus; (c) the bottom of tumor was ligatured by OTSC; (d) dissection of the tumor; (e) the wound was clipped after the procedure; (f) the resected tumor; (g–j) HE staining, magnified pathological images; (k–q) immunohistochemical staining, CD34(+), DOG-1(+), CD117(+), SMA(-), S-100(-), desmin(-), and Ki-67(+, <1%).

(a)

(b)

(c)

(d)

(e)

(f)

(g) ×20

(h) ×100

(i) ×200

(j) ×400

(k) CD34

(l) DOG-1

(m) CD117

(n) SMA

(o) S-100

(p) Desmin

(q) Ki-67