Focal myositis of the tongue presenting as macroglossia.

Focal myositis (FM) is a benign localized inflammatory process of unknown aetiology, which presents as a rapidly enlarging soft-tissue mass that evolves into a localized lesion. It is most often mistaken for a neoplasm. Histologically, it is characterized by marked myopathic changes of the muscle fibres, lymphocytic infiltration and interstitial fibrosis. We describe a case of focal myositis of the tongue and review this rare condition.