A case report of endocrine cell carcinoma in the sigmoid colon with inferior mesenteric vein tumor embolism

Figure 1 Colonoscopy showing a type 2 shaped tumor mainly located in the sigmoid colon.

Figure 2 Computed tomography showing a hypertrophic colon wall in the sigmoid colon and dilation of IMV (arrows).

Figure 3 Resected specimen. A: A type 2 shaped tumor was located in the sigmoid colon with tumor embolism of IMV which was 14 cm long (arrows); B: In transverse section, the tumor embolism was 2 cm long.

Figure 4 Histological features. Nuclei of the endocrine cell carcinoma cells were irregular in size, and mitotis was frequently seen with extensive vein invasion partially penetrating the vein wall (arrows).

Figure 5 Histological features. Nuclei of the endocrine carcinoma cells were irregular in size, and mitosis was frequently identified.

Figure 6 Immunohistochemical features. The endocrine carcinoma cells were immunoreactive for chromographin A, synaptophysin and CD56 (NCAM).