<p align="justify"><span style="color: #000000;"><span style="font-family: Arial, serif;"><span><span lang="en-US">A case of solitary fibrous tumor is reported. Solitary fibrous tumor is a rare neoplasia characterized by the proliferation of fusiform cells of mesenchymal origin accounting for at least </span></span></span></span><span style="font-family: Arial, serif;"><span><span lang="en-US">2% of all soft tissue tumors. In this present case, the initial diagnosis was salivary gland tumor because of the location in the hard palate. </span></span></span><span style="color: #000000;"><span style="font-family: Arial, serif;"><span><span lang="en-US">Histologically, the tumor was composed by conjunctive tissue with proliferation of oval and fusiform cells. The immunohistochemical analysis was positive for CD34 and CD99. The lesion was treated by surgical resection. The clinical, imaging, histological and immunohistochemical data are discussed in this study. </span></span></span></span></p><p lang="en-US" align="justify"> </p><p align="justify"><span style="color: #000000;"><span style="font-family: Arial, serif;"><span><span lang="en-US"><strong><span>Keywords</span></strong></span></span></span></span></p><p align="justify"><span style="font-family: Arial, serif;"><span><span lang="en-US">Solitary fibrous tumor; Oral cavity; Hard palate; Differential diagnosis.</span></span></span></p><p lang="en-US" align="justify"> </p>

A case of adult rhabdomyoma is reported. The lesion is a rare benign tumor of skeletal muscle origin which occurs predominantly in the head and neck region. In the present case, the clinical diagnosis favored a benign salivary gland tumor. Histologically, the tumor was composed of large round, oval, and polygonal cells of varying size with abundant pale, eosinophilic, fine, granular cytoplasm with peripherally located nuclei. Immunohistochemically, the lesion was positive for muscle-specific actin, smooth muscle actin, desmin, S100 protein, and Masson's trichrome. Electron microscopic examination confirmed the presence of numerous myofibrils. The lesion was treated by surgical resection. The clinical, histological, immunohistochemical, and ultrastructural features are discussed in this study.

No abstract

No abstract

No abstract