Collagenous fibroma (desmoplastic fibroblastoma) is a rare benign soft tissue tumor with a fibroblastic origin. In oral mucosa only two cases have been described in the literature. We describe the case of a 42-year-old white woman whose complaint was a painless, slow-growing mass under the prosthesis. Histopathologic features included sparsely distributed stellate or spindle fibroblasts within a rich collagenous stroma. Tumor cells were diffusely stained for vimentin and rare cells stained for smooth muscle actin and factor XIIIa. Total surgical excision was performed and no recurrence is expected.
Collagenous fibroma; Desmoplastic fibroblastoma; Soft tissue tumors; Immunohistochemistry
