Myopericytoma of the coronoid process: a case report and review of the literature

• We describe a 12-year-old boy with myopericytoma (MPC) of the coronoid process.
• This is the second reported case of MPC in the mandible.
• The tumor was surgically excised with no complications or recurrence.
• Histologic and immunohistochemical analysis aided in the diagnosis of MPC.

Myopericytomas (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-year-old 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.