Fig. 1

Histological and immunohistochemical analysis of primary testicular carcinoid tumor tissue. Histological analysis (H&E staining) shows nested cuboidal cells with prominent round nuclei and reduced amount of cytoplasm, arranged in a ribbon-like structure and surrounded by moderate fibrotic stroma (a), with a positive immunohistochemical staining for Chromogranin A (b), CD 56 (c), Ep-4 (d), Cdx-2 (e) and Mib-1(f) pointed out by arrows. Scale bars 100 µm