title: Myofibroma of the mandible. Clinicopathologic study and review of the literature.
abstract: A case of mandibular myofibroma in a 2-month-old boy is presented. Including this case, 24 pediatric and 11 adult patients with maxillofacial myofibroma have been reported since 1981. Of the 24 pediatric patients, 15 (62.5%) had lesions affecting the mandible. The adult cases had no mandibular involvement. Histologic evaluation of the tissue specimen revealed an interlacing pattern of spindle-shaped cells with long oval nuclei. Tissue immunohistochemical staining found it to be reactive for antibodies directed against vimentin and alpha-smooth muscle actin, but not desmin, S-100 protein, neuron-specific enolase, or myoglobin. Electron microscopy examination revealed the following cells: myofibroblast-like cells, fibroblast-like cells, and intermediate cells that were similar to the fibroblast-like cells except for the presence of a few microfilaments. Myoblast-like cells were not seen.
mesh_terms: D008841:Actin Cytoskeleton / Q000648:ultrastructure; D000199:Actins / Q000032:analysis; D000328:Adult; D002467:Cell Nucleus / Q000648:ultrastructure; D003893:Desmin / Q000032:analysis; D005347:Fibroblasts / Q000473:pathology; D005500:Follow-Up Studies; D006801:Humans; D007150:Immunohistochemistry; D007223:Infant; D007889:Leiomyoma / Q000473:pathology*; D008297:Male; D008339:Mandibular Neoplasms / Q000473:pathology*; D008854:Microscopy, Electron; D009211:Myoglobin / Q000032:analysis; D010751:Phosphopyruvate Hydratase / Q000032:analysis; D009418:S100 Proteins / Q000032:analysis; D014746:Vimentin / Q000032:analysis
chemical_list: D000199:Actins; D003893:Desmin; D009211:Myoglobin; D009418:S100 Proteins; D014746:Vimentin; D010751:Phosphopyruvate Hydratase