Fig. 3
From: Desmoid-type fibromatosis mimicking cystic retroperitoneal mass: case report and literature review
Retroperitoneal desmoid-type fibromatosis in a 46-year-old man. a Microscopically, the tumor is composed of uniform, elongated spindle-shaped cells within a collagenous stroma. Spindle cells show mild nuclear pleomorphism and no mitotic figures (hematoxylin and eosin stain; original magnification × 100). b On a lower power view, tumor cells are diffusely infiltrating into the pancreatic parenchyma (asterisks) (hematoxylin and eosin stain; original magnification × 40). c Immunohistochemical study of the tumor shows strong nuclear and cytoplasmic positivity for intranuclear β-catenin (β-catenin; original magnification × 100)