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Introduction: Pleomorphic adenoma is the most common head and neck benign glandular tumor. Pleomorphic adenoma of the maxillary sinus has rarely been described in the literature. Objective: To report a case of a patient with a unilateral nasal mass, originated from the maxillary sinus, with histopathological diagnosis of pleomorphic adenoma. Case Report: A.O.V., 55-year-old male Caucasian patient, who had been suffering from nasal obstruction for years and also presented a polypoid mass in the left nasal cavity. Patient was submitted to endoscopic tumor resection and diagnosed of pleomorphic adenoma. Conclusion: Although pleomorphic adenoma is a rare type of tumor, it is benign, and it must be distinguished from other nasal tumors associated with chronic nasal complaints.