a b s t r a c tMyopericytomas (MPCs) are rare tumors that originate from perivascular myoid cells and are typically found in middle-aged men. MPCs are most commonly found in the distal extremities, but a number of reports indicate that MPC can occur in the head, neck, and oral cavity. Here, we report a case of a 12-yearold boy with MPC in the left coronoid process, which we believe to be the second reported case in the mandible. The patient underwent surgery to excise the tumor. Its avascular nature and low mitoses strongly suggested that the tumor was benign, in accord with most reported MPCs. Histology and immunohistochemistry revealed that the tumor displayed features most consistent with MPC and angioleiomyoma. The rare occurrence and broad spectrum of growth features make MPCs difficult to identify and classify. Future work is required to better characterize MPC.

Sarcomatous carcinomas (SCs) are rare tumours that contain malignant cells with epithelial and mesenchymal characteristics. SC rarely presents in the head and neck, and occurs even less often in the orbit. Only 8 cases of SCs located in the orbit or affecting the globe function have been described in the English literature. Here, we report a case of SC affecting the right orbit. SC is associated with a poor prognosis and advanced disease at presentation. Diagnosis is difficult, as histology often fails to definitively identify SC, necessitating a wide panel of molecular/immunological markers. Treatment options are generally aggressive but risky, and frequently yield poor results. Due to the rarity of SC, there has been little focus on the development of improved treatment options.