Metastasis of a Poorly Differentiated Endometrioid Carcinoma to the Maxillary Sinus: A Rare Report

In this case report, we present a rare case of an endometrial carcinoma metastasizing to the maxillary sinus. It is the fourth reported case of an uterine malignancy with metastasis to the sinonasal cavities; however, this is the first described in the maxillary sinus. This case demonstrates a rare lesion for a common cancer. Unfortunately, metastatic lesions to the sinonasal cavities are often associated with advanced disease and confer a poor prognosis.