Figure 4.

Representative trans-serosal CP OCT images of ischemic ileum without necrosis. (a,d) In the B-scans co–c) and cross–(d) channels and in 3D OCT image (e) the general architecture of the serous membrane (1) and muscularis externa (outer longitudinal—2a and inner circular—2b layer of smooth muscle) are clearly resolved with the extensive accumulation of intermuscular fluid (white and black arrows) within each layer. The boundary between the circular muscular layer (2b) and the submucosa (3) is more clearly visible in the B-scan cross—image (d). (a,b) En-face OCT images at the level of the longitudinal muscular layer (green horizontal line in (e)), intermuscular spaces (white arrows) are longer and wider than in norm (Figure 3a,b). (f) Corresponding histological image, H&E staining. Black arrows indicate intermuscular edema. Scale bars 1 mm.