Fig. 3
From: Portal vein leiomyosarcoma: a case report and review of the literature
a Hematoxylin-eosin (HE) staining of the surgical specimen (magnification × 40). Arrows surrounding the portal vein, bundles of neoplastic smooth muscle cells partially infiltrating the portal vein (*). b HE staining of the surgical specimen (magnification × 100). Arrows indicate the adventitia of the hepatic artery without infiltration of the arterial wall (+). c, d The tumor stained positive for smooth muscle actin (c) and caldesmon (d) upon immunohistochemistry (magnification × 100)