Fig. 3
From: Epithelioid solitary fibrous tumors from CNS and soft tissues: an unusual morphologic variant
Epithelioid solitary fibrous tumors of case 3. A, The tumor arranged in solid sheet or nodular pattern. B, The tumor was composed of uniform medium to large-sized epithelial cells, with transparent or acidophilic cytoplasm and abundant curved blood vessels in the center. C, Moderate atypia was observed. D, focal ossification and osseous matrix deposition. E,The tumor center exhibited features of stale hemorrhagic and collagenous nodules formation. F to H, Immunohistochemistry showed diffuse nuclear expression of STAT6 (F) and cytoplasmic expression of CD34 (G), with SATB-2 positive in the ossification region (H)