Beschreibung:
<jats:sec><jats:title>Objective</jats:title><jats:p>To identify anatomic and radiologic landmarks to assist with frontal sinus surgery.</jats:p></jats:sec><jats:sec><jats:title>Study Design</jats:title><jats:p>Retrospective review.</jats:p></jats:sec><jats:sec><jats:title>Subjects and Methods</jats:title><jats:p>Sinus CT scans of 50 patients were evaluated with respect to a new radiologic and anatomic landmark, the ethmo‐frontal angle (EFA).</jats:p></jats:sec><jats:sec><jats:title>Results</jats:title><jats:p>Right‐sided EFA ranged from 135 to 171 degrees. Left‐sided EFA ranged from 136 to 167 degrees. Measurements of both sides displayed a normal distribution. When right and left sides within individuals were compared, there was no correlation to indicate a high degree of variation between any particular patient's right and left side EFA.</jats:p></jats:sec><jats:sec><jats:title>Conclusion</jats:title><jats:p>The EFA is a new landmark to assist otolaryngologists during surgery on and around the frontal sinus. Normal values for this angle have been presented. Surgeons should be aware that asymmetry in a patient's EFA is common, and each side should be examined individually.</jats:p></jats:sec>