The literature on osteoma of the sinuses consists predominantly of reports of single cases or enumerations of cases reported previously, so that one might suppose the condition to be rare. Although the total number of cases reported up to 1935 was variously given as 1451 and 1472 and may not now exceed 200, since relatively few cases have been reported each year since then, it seems probable that this condition is far more common than is generally supposed and that many osteomas are not reported. The cases in the medical literature have been, as a rule, those in which the growth was extensive, with definite symptoms and with invasion of neighboring structures, in which diagnosis was not difficult and in which the need for treatment was urgent. In support of the thesis that osteoma, although unusual, is not rare, 15 cases in which that diagnosis was made in the past