摘要：Paranasal sinuses are prone to a great diversity of anomalies. It is important for surgeons to be aware of variations that may predispose patients to increased risk of intraoperative complications and help avoid possible complications and improve success of management strategies. Plane x-rays can be widely used to map sinus anatomy prior to surgical intervention to limit morbidity. The frontal sinus has been used for personal identification since the early part of the 20th century as a result of its tremendous interindividual variation. The frontal sinus is present in approximately 90% of adults. However, some populations have a higher proportion of people without a frontal sinus. This study investigated the frequency of the absence of frontal sinus in Karnataka region of India. The present study was performed retrospectively on radiographs from a series of 238 cases. A bilateral absence and a unilateral absence of sinuses were found in 6(2.5 %) and 2(0.84 %) of cases, respectively. The clinical significance of the frontal sinuses and their absence are also discussed.
