Figure 2

Lesions of the duodenum, the posterior parietal peritoneum, and the root of the mesentery involving the SMA are shown. A: The dense fibrotic and thickened peritoneum pulled the root of the mesentery involving the SMA superiorly, which made the SMA tense tightly. The SMA compressed the third portion of the duodenum indicated by small white arrows. In addition, the root of the mesentery was thickened and had adhered to the surface of duodenum, which reduced the duodenal motility. The duodenum proximal to the compressed site was also dilated. B: Histopathology of lesion site in the duodenum (hematoxylin and eosin staining). Mucosal necrosis was apparent at the dilated proximal duodenum and there was dense fibrotic degeneration in the thickened peritoneum around the duodenum.