In accepting your invitation to open the discussion on this most important and interesting subject, I feel that I can not do better than first to call your attention to a few of the anatomic peculiarities of the frontal sinuses, in order that the pathology and treatment of chronic suppurative inflammations of these cavities can be the better understood.
The size of the frontal sinuses varies greatly in different subjects, and frequently in the same subject the variation is very marked, one cavity occasionally being quite large while the other is many times smaller, or absent altogether.
After an examination of 120 skulls made by Herbert Tilley1 he considers a sinus normal when it measures 28 mm. from the median line outward to about the junction of the inner and middle third of the supraorbital ridge; and in vertical extent measured from the root of the nose from 20
BRYAN JH. THE TREATMENT OF EMPYEMA OF THE FRONTAL SINUS. JAMA. 1898;XXX(9):483–486. doi:10.1001/jama.1898.72440610031001m
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