Fig. 2

The lesion was unencapsulated and composed of blood-filled spaces of variable size and shape. The lumens were filled with blood cells and lined by thin endothelial cells and separated by connective tissue stroma. The images were obtained after H&E staining under a magnification of 100×. A, B The lesion of distal ileum stated at submucosa or serosa. C, D The lesion of colon stated at submucosa or through the muscularis. E Some colon mucosa showed interstitial hemorrhage