Adenocarcinoma (malignant cancer from gland tissues) is a common tumor of the sinuses, forming on the lining tissues, which are the air-filled areas that make up the inside of the facial bones. The greatest risk factor for getting one of these types of sinus cancer seems to be inhaling high levels of wood and leather dusts.
These tumors are traditionally classified as low grade and high grade. The low grade types are more likely to come back in the area where they began, while the high grade malignancies can metastasize (spread to other areas). Much like squamous cell cancer (another type of malignant tumor starting in the sinus lining), adenocarcinoma often responds to the addition of radiation therapy and/or chemotherapy to surgical removal.
Learn more at the New York Head and Neck Institute.