Histopathological and immunohistochemical findings. (A) Low-powered photomicrograph showing proliferation of islands and cords composed of small cells displaying either basaloid or fusiform morphology, a thick collagenized cellularized stroma with little inflammatory infiltrate. (B) In detail, neoplastic cells with pleomorphic and hyperchromatic nuclei. The cells in the tumour islands and cords were strongly positive for enolase (NSE), synaptophysin (SYN) and vimentin (VIM3B4). Some positive expression was also observed in the stromal cells. (Haematoxylin-eosin, original magnification x20[A], x100[B]; Immunohistochemical staining, original magnifications x40).