Metastasis of breast cancer in paranasal sinus are rare. Only few cases have been reported until now. The presence of rhinological
or neurological signs in a patient with a past history of breast cancer should raise the awareness of the practitioner. The treatment
is generally palliative. We report, in this manuscript, the case of a 50-year-old female patient treated for breast cancer ten years ago
for breast cancer, who presented with a metastasis to the sphenoid sinus.