[Ethmoid metastasis of primary breast tumor].

Metastatic tumors to the paranasal sinuses are uncommon. Symptoms and imaging studies are non-specific and usually similar to primary neoplasms in this region. Histological study of the neoplastic tissue is essential in order to ascertain its origin. A case of breast adenocarcinoma that metastasized to the ethmoid sinus is reported and the literature is reviewed.