Carcinosarcoma is a highly aggressive and infiltrative tumor. A finding of this tumor in a paranasal sinus is exceedingly rare. We describe the case of a 61-year-old man who presented with a mass on the left side of his face. The mass was excised via a total maxillectomy with a modified radical neck dissection. Histologic analysis identified a mixture of carcinomatous and sarcomatous components. Within 1 month of surgery, the patient developed a sternal metastasis, and he died within a short period of time. The aggressive nature of this tumor and its metastases demand early diagnosis and prompt treatment.
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