Fig. 2
From: Epithelioid solitary fibrous tumors from CNS and soft tissues: an unusual morphologic variant
Epithelioid solitary fibrous tumor of case 2. A, The tumor consisted of large epithelioid cells and displayed growth patterns with solid sheet structures. B, The tumor consisted of epithelioid cells and displayed growth patterns with papillary or pseudopapillary arrangements. C, Some tumor cells displayed eccentric nuclei akin to plasma cells. D, Significant cellular atypia was observed, even with the formation of multinucleated giant cell. E, Tumor cells showed brisk mitotic activity. F, Focal ossification can been observed G to I, Immunohistochemistry showed diffuse nuclear expression of STAT6 (G) and cytoplasmic expression of CD34 (H), with SATB-2 positive in the ossification region (I)