Prof. Hisham Youssef Ibrahim Algazar :: Publications:

Objective: to determine the AEA anatomy and variations by computed tomography (CT) in adult and their relations to and presents new AEA classifications. Methods: 150 Paranasal CT scans (300 sides) were included. Axial images were acquired with multiplanar reformates to obtain delicate details in coronal and sagittal planes. Results: 144 AEAs canal (48%), 293 AEAs foramen (97.7%) and 229 AEAs sulcus could be detected (76.3%). The mean AEA intranasal length was 6.7±1.27 mm (range: 4.24-10.6). The mean angle between AEA and lamina papyracea was 105.49°±9.28° (range: 76.41°- 129.76°). 95.8% of the AEAs had an angle with lamina >90° while 4.2% had angle 90° and 12.5% had an angle 6 mm) (2.1%). The mean distance between the AEA and frontal sinus ostium was 9.17±4.72 mm (range: 0-25.36). AEA classification according to distance from AEA to frontal sinus ostium was 17.4% type 1 (15mm). Conclusion: Provided AEA details improve surgeons' awareness of AEA variations in the endoscopic field and can help residents in training.