PMC5395791_01
A mass at the ascending colon demonstrated on CT scan of abdomen and pelvis. The arrow showed a circumferential thickening of a segment of ascending colon due to colonic mass
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PMC5395791_01_40164_2017_69_Fig1_HTML.jpg
Fig1
He underwent CT scan of abdomen and pelvis and colonoscopy, and was found to have a 3-cm mass in the proximal ascending colon (Fig. 1).
Microscopic finding of the colon tumor. Biopsy by colonoscopy showed poorly differentiated squamous cell carcinoma with dense cytoplasm, irregular nuclear contours, moderate pleomorphism and prominent nucleoli (hematoxylin and eosin stain, x40). Additional immunohistochemical study and comparison to prior tumor histology indicated metastatic rather than a primary colorectal carcinoma
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PMC5395791_01_40164_2017_69_Fig2_HTML.jpg
Fig2
The biopsy showed metastatic SCC (Fig. 2).