Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40792-020-00963-1/MediaObjects/40792_2020_963_Fig1_HTML.png)
Image of the transverse colon cancer. Colonoscopy showed a type 3 tumor with necrotic tissue (a). Contrast-enhanced CT did not indicate colon cancer (b). Positron emission tomography showed an accumulation of 18F-fluorodeoxyglucose in the colon (c)