Abstract : The blood supply to the lateral sinus walls and the sinus floor membrane is provided by maxillary artery through a branch named posterior superior alveolar artery (PSAA). [1] preoperative radiological evaluation to detect and locate the exact position of the artery to avoid traumatizing these arteries and subsequent perioperative bleeding, during any surgical intervention [2]. Cone beam computed tomography (CBCT) is appropriate for craniofacial area imaging. It shows precise images of well-contrasted structures; it is also suitable for bone imaging [3], [4]. In addition, the usage of the CBCT technique in the clinical application offers several impending benefits for “maxillofacial imaging including: X-ray beam restriction”, image precision, dose reduction and rapid scan time [5].