Fig. 3

Photomicrograph of granulation tissue between submucosa and muscle layers at the anastomotic site for each group (a Byosin unbarbed suture, b unidirectional barbed suture, c bi-directional barbed suture). a Foreign material—suture surrounded by a large amount of inflammatory cells (lymphocytes and giant cells (*); b, c a large hole indicates the area of suture material, surrounded by a large number of inflammatory cells (*) and abundant fibrous tissue with a lot of collagen fibres. Hematoxylin–Eosin; Bar: 100 µm