Figure 1: (a) Intraoperative image of tumor marked with yellow arrow (b) (A) the section shows presence of a tumor in the serosal layer (H&E;x4), (B) the tumor is composed of oval to spindle cells, arranged in sheets with the presence of chronic inflammatory infiltrate (H&E;x10), (C) the tumor cells have elongated, prominent nuclei and moderate eosinophilic cytoplasm (H&E;x40), (D) immunopositive to vimentin (IHC;x10), (E) immunopositive for ALK1 (IHC;x10), (F) immunopositive for SMA (IHC;x10), (G) immunonegative for S-100 (IHC;x10), (H) Ki-67 proliferating index-1% (IHC;x10). SMA: Smooth muscle actin