Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40792-017-0356-5/MediaObjects/40792_2017_356_Fig1_HTML.gif)
The pathological features of specimen resected after the first operation. The tumor was seen in the intramucosal layer (a) (HE, ×20), which was well-differentiated adenocarcinoma (b) (HE, ×200). Schematic summary of the patient’s long-term clinical history. HE hematoxylin and eosin (c)