Abstract
During postoperative course following the surgery of the chronic frontal sinusitis, the sinus patterns on X-ray films were customarily described as “solidly filled”, “reduced”, “ unchanged” or “enlarged” in size without any clear cut implication.
The author, therefore, studied the normal frontal sinus size under development and wasconvinced that the size would be reasonably well described as follows: “unchanged ” when thesize change is within±30%, “enlarged” over+30% and reduced below -30%.
With these criteria, comparative studies in size changes between the diseased and thecontrateral normal frontal sinuses were made pre and postoperatively.
