PMC3590504_01
(a), (b) Colonoscopic view of the signet cell tumour in sigmoid colon. The colonoscopy could not been completed according to the obstruction.
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fig1
Then colonoscopy and gastroscopy were performed and while there was no pathological sign in gastroscopy, an obstruction in sigmoid colon has been detected by colonoscopy (Figures 1(a), and 1(b)).
A number of signet cells regarding signet cell carcinoma can be seen in the submucosal layer of vascular structures. (H&E; 100x).
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fig2
Biopsy results were reported as signet ring cell carcinoma of sigmoid colon (Figure 2).