Most head and neck tumors are diagnosed at advanced stages, due to patient and health care factors.

Several studies demonstrated that the AEC is not always continuous in its bony structure, but it may show a partial or complete bone dehiscence in its most caudal portion. 1,3,4 Significant intrasubject side-to-side variability may exist so that the bony canal can be complete on one side and partially or completely open on the other one.Moreover, useful information about the distance of the AEA from the columella, 5 the middle turbinate axilla and the nasal valve 1,6 has been provided. AbstractIntroduction The clinical relevance of the anatomy and variations of the anterior ethmoidal artery (AEA) is outstanding, considering its role as a landmark in endoscopic surgery, its importance in the therapy of epistaxis, and the high risks related to iatrogenic injuries. Objective To provide an anatomical description of the course and relationships of the AEA, based on direct computed-tomography (CT)-based 3D volume rendering. Methods Direct volume rendering was performed on 18 subjects who underwent (CT) with contrast medium for suspected cerebral aneurism. Results The topographical location of 36 AEAs was assessed as shown: 10 dehiscent (27.8%), 20 intracanal (55.5%), 6 incomplete canals (16.7%). Distances from important topographic landmarks are reported. Conclusion This work demonstrates that direct 3D volume rendering is a valid imaging technique for a detailed description of the anterior ethmoidal artery thus representing a useful tool for head pre-operatory assessments.

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Maxillary sinusitis can represent a rare complication of dental implants of endodontic materials impinging in the maxillary sinuses. The effects of anatomical variants of paranasal sinuses on pathophysiological and clinical manifestations of dental sinusitis are poorly understood. Herein, we present a case of dislocation of a dental implant in the ethmoidal sinus in a 63-years old man with bilateral accessory maxillary orifice. This anatomical variation, by providing an additional way for the drainage of mucus in the maxillary sinus, could have allowed the dislocation of the implant in the ethmoidal sinus without causing mucus stagnation and consequent sinusitis, leading to a unusual clinical presentation. .