Fig. 2

Histopathological and immunohistochemical features of the core needle biopsy specimen: a Low-power view of the needle biopsy specimen. b Atypical epithelioid tumor cell nests infiltrating the hyperplastic collagen fibers mimic a metastatic carcinoma. c These tumor cells are round to polygonal with atypical mitoses (arrows) and are positive for CD23 (d)