Fig. 3
![Fig. 3](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40792-021-01284-7/MediaObjects/40792_2021_1284_Fig3_HTML.png)
Endoscopic ultrasonography (EUS) showed a lobulated, low-echoic mass with a clear boundary at the pancreatic body and tail (a). The tumor cells in the EUS-fine needle biopsy specimens were spindle shaped and diffusely immunopositive for S-100 (b)