Ethmoidal myofibroblastoma.

Myofibroblastoma is an uncommon mesenchymal tumour characterized by spindle cells exhibiting the ultrastructural and immunohistochemical features of myofibroblasts. We report a case of a myofibroblastoma occurring in the ethmoid sinus, which to our knowledge is the first case reported in the literature. The clinical presentation, diagnosis, histology, and management of this lesion is discussed with a review of the relevant literature.