![]() It has been hypothesized that fossa navicularis magna is an anatomical variant that may form from either the persistence or enlargement of emissary veins or as a result of remnants of the notochordal canal. Keywords: Cone-Beam Computed Tomography, Skull Base, Clivus Fossa, Posterior, Multidetector Computed Tomography The pertinent literature on the anatomical variations occurring in this region was reviewed. Fossa navicularis magna is an anatomical variant that occurs on the inferior aspect of the clivus. In some, it was completely within the basiocciput and mimicked a small rounded, corticated, lytic defect, whereas it appeared as a notch in others. The appearance of fossa navicularis magna varied among the cases. CBCT analysis showed osseous, notch-like defects on the inferior aspect of the clivus in all four cases. The CBCT data of the patients in question were referred for the evaluation of implant sites and to rule out pathology in the maxilla and mandible. Herein, we report and discuss the detection of fossa navicularis magna, a close radiographic anatomic variant of canalis basilaris medianus of the basiocciput, as an incidental finding in cone-beam computed tomography (CBCT) imaging.
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