Fig. 1

Histopathology of two cases of solitary fibrous tumor /hemangioperictyoma (HPC). Representative snapshots of H&E (A, D, G, 200X and J, 400X), Immuno-staining of marker STAT6 (B, E, H, K, 400X) and Ki76 (C, F, I, L, 400X). (A and G) Case 1 primary and second recurrent tumors showing foci of necrosis (asterisk). (B, E, H) STAT6 expression grew higher in the recurrent tumors of Case 1 compared to their previous form. (J) Case 2 high power field showed haphazardly arranged spindle cells with moderate cytological atypia, set in collagenous stroma intermixed with staghorn vessels (asterisk), and lack of mitotic figures. (L) Case 2 had much lower expression of Ki67 compared to (C, F, I) Case 1. (See more information in Additional file 1: Fig. S1)