A rare case of aggressive fibromatosis in the maxillary sinus

Aggressive fibromatosis (AF) is a locally aggressive benign soft tissue tumor. It is rarely observed in the head and neck region and is particularly uncommon in the maxillary sinus. We report the case of a 40-year-old man who presented with left nasal purulent discharge and dull pain in the left maxillary region. Computed tomography of the head and neck region revealed an infiltrative mass in the left sinus and bone resorption of the posterior wall of the maxillary sinus and alveolar bone. Examination of biopsy samples, obtained twice, did not lead to a definite diagnosis. The tumor was removed by radical sinusotomy under general anesthesia. Histopathological analysis of the excised tumor revealed AF. No recurrence or metastasis was found 2.5 years after tumor excision. As AF of the oral and maxillofacial region frequently recurs, we recommend long-term follow-up of the patient.