Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40792-017-0292-4/MediaObjects/40792_2017_292_Fig4_HTML.gif)
Microscopically, the resected specimen was composed of eosinophilic tumor cells with oval nuclei and prominent nucleoli, which exhibited a cribriform and fused glands pattern by hematoxylin-eosin staining (a) and stained positive for prostate-specific antigen (b) as well as prostatic acid phosphatase (c) (×100)