Stones are not uncommon in the nasal cavities; in the maxillary sinuses they are rare, and there have been no reports of their occurrence in the other paranasal sinuses. Only 8 acceptable cases of maxillary sinus stones have been reported (2–9). In some of the older cases, the clinical history is incomplete, but most of the stones apparently formed upon a foreign substance in the sinus, as a piece of a tooth root, bone, or paper. All the patients showed evidence of infection in the involved sinus, usually with profuse, offensive, purulent drainage. In most instances this condition had existed for many years. A ninth case is here added to the literature. Case Report A white woman, aged 56, was referred by Dr. Beverly N. Jones, Sr., on Jan. 26, 1948, for roentgen examination of the sinuses. She stated that a dentist had removed an upper right molar in 1933. The next day there was a little swelling about the site of the extraction, with moderate swelling in the region of the right maxillary sinus. The follow...