Gross examination of the surgical specimen revealed a solid, nodular, well-circumscribed, white mass. The cut surface was firm and had a homogeneous appearance without any evidence of necrosis or hemorrhage. Histologically, the lesion was characterized by a thin fibrous capsule and was composed of a proliferation of spindle cells with small nuclei and a collagen-rich stroma. Within the fibrocollagenous tissue, there were several dystrophic calcifications, psammoma bodies, lymphoid aggregates, and a few foamy macrophages (Figure 2). Immunohistochemical staining showed negative results for antibodies against S-100 protein, caldesmon, smooth muscle actin, desmin, CD34, CD117 (c-kit), anaplastic lymphoma kinase protein, and keratin. Stains were focally positive for β-catenin. Proliferation index Ki67 was inferior to 1%. No lymph node metastasis was observed.