Fig. 3
![Fig. 3](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40792-017-0356-5/MediaObjects/40792_2017_356_Fig3_HTML.gif)
No specific target lesions were observed by rectal endoscopy (a) and CT (b). Endoscopy showed that anorectal mucous membranes had become rough (c). CT revealed thickening of the anorectal wall (circle) and bilateral inguinal lymph node metastasis (arrow head) (d)