RESUMEN
The availability of frontal sinus patterns for personal identification has been studied. The anteroposterior X-ray view of 100 persons was studied regarding six items: The size of both sinuses in cm2 using a digital planimeter KP 90; the asymmetry index which is equal A/Bx100 where A is the area of smaller sinus and B is the area of the larger one; the unilateral superiority of one sinus over the other; the shape of the sinus according to the sum of the number of arcades; the characters of partial septa and the presence or the absence of supraorbital cells. Each of the previous items was classified into many categories and a class number was given to each category, so the frontal sinus pattern for every person was formulated as a code number composed of many class numbers. In this study, the paranasal sinus X- ray of any two persons can never be identical as regard the frontal sinus patterns