Onodera K, Xu H, Kimizuka S, Echigo S, Ooya K
Division of Oral Pathology, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Sendai, Japan.
Int J Oral Maxillofac Surg. 2005 Dec;34(8):924-6. doi: 10.1016/j.ijom.2005.02.012. Epub 2005 Jun 13.
An extremely rare case of soft tissue chondroma occurring in the right cheek of a 47-year-old woman is reported. The localized nodular tumor was encapsulated and composed of hyalinized cartilage with fine calcifications. Most tumor cells were positive for vimentin and S-100 protein, but negative for cytokeratin, factor VIII, and smooth muscle actin. It seems likely that the tumor cells arise from uncommitted mesenchymal stem cells by metaplastic process.