Desmoplastic fibroblastoma

Fibroma of tendon sheath and collagenous fibroma (desmoplastic fibroblastoma) are usually sufficiently distinct clinically and histologically to separate them from fibromatosis. They often react either diffusely or focally for muscle-specific actin and smooth muscle actin and may even show faint S-100 positivity.Desmin, however, is not found. In addition to sharing an immunophenotypic profile, fibroma of tendon sheath and collagenous fibroma have been observed to harbor the same abnormality of chromosome... 

Ide F, Shimoyama T, Horie N, et al. Collagenous fibroma (desmoplastic fibroblastoma) presenting as a parotid mass. J Oral Pathol Med. 1999 28 465-468. 

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