Fig. 4.

A and B: Slides stained with Hematoxylin and Eosin stain with 4x (A) and 10x (B) magnification) demonstrates intermediate cellularity with a uniform population of spindle cells with attenuated cytoplasm and oval slender nuclei with pointed cells. Bundles of collagen fibers resembling keloidal collagen are seen interspersed between the neoplastic cells. No atypical mitotic figures or necrosis is seen. C and D: Immunohistochemical staining demonstrates strong nuclear staining with beta-catenin (C), favoring fibromatosis. CD34 (D) is patchy positive.