抄録
The author studied histologically frontal sinuses in 61 human frontal bones (74 sides), whose age ranged from 5 months to 80 years and a frontal bone of a 39-year-old male with pneumoeinus dilatans.
The author concluded that;
1. an increased pressure in the frontal sinus was not substantiated with a plausible evidence as a cause for development of the condition.
