Paranasal sinus osteomas are benign tumours, occasionally known to cau
se complications. They have a tendency to grow slowly, but the growth
rate has never been evaluated;previously. We retrospectively studied 4
4 patients with paranasal sinus osteomas. In 13 out of the 23 patients
who underwent at least two sinus radiographs at different times some
growth was seen. The mean growth rate of these 13 osteomas was 1.61 mm
/yr, range 0.44 to 6.0 mm/yr. The endoscopic technique is a good metho
d for the removal of osteomas and obliteration of the frontal sinus do
es not seem to be necessary. Two patients having osteomas with intracr
anial expansion are described.