Proliferative myositis of the head and neck. Report of a case and review of the literature.

A case of proliferative myositis arising in the tongue is described. Light and electron micrographs revealed the characteristic infiltrative growth pattern and cellular pleomorphism of this lesion. A review of the literature disclosed 50 reported cases of proliferative myositis, including 10 that originated in the head and neck. The rapid growth rate and unusual gross and histologic appearance of this infiltrative lesion have contributed to its relatively frequent misdiagnosis and inappropriate treatment. Consequently it is hoped that this report will help clarify its benign nature.