Figure 5:
A: Macroscopically, the anastomosis around the ascending colon, which was the primary site, revealed a circumferential 84×52 mm type 3 tumor with superficial necrotic tissue. The necrotic tissue adhered to the superficial layer.
B: The tumor was a grayish-white, dense tumor seated in the intrinsic muscularis propria, with atypical spindle-shaped cells in the tumor area, infiltrating into the subplasma membrane and showing atypical nuclear fission. The serosa layer of the colon was filled with fibrous hyperplasia, vessel hyperplasia, inflammatory cell infiltration, and necrotic tissues. The serosa layer of the colon was filled with fibrous hyperplasia, vessel hyperplasia, inflammatory cell infiltration, and necrotic tissues.
The dotted line is the anastomosis.
C and D: Further immunohistochemical analysis showed that the tumor cells were positively stained for α1-antichymotrypsin (Fig. 5C) and vimentin (Fig. 5D).