Three-dimensional ct angiography for evaluating anatomic variations of the skull base in the region of the intrapetrous carotid

Introduction: We evaluated 3-D CTA as a means of obtaining detailed anatomic information regarding differences in bony landmarks and spatial relationships in the region of the petrous carotid. Methods: Thirty patients underwent CT angiography with 1-mm slices reconstructed into dynamic 3-D images. Special attention was given to the course and landmarks surrounding the petrous carotid. Results: Highly variable amounts of bone were present between the carotid and the petrous apex. The width of bone from the trigeminal impression to the posterior wall of the IAC averaged 12.1 mm (range, 8.5 to 14.2 mm). Considerable variations were also present in the bony portion of the EAC and the tympanic bone which would require different amounts of drilling in order to expose the ascending portion of the intrapetrous carotid medial to the eustacian tube. Conclusions: This technique may have important therapeutic implications with regards to planning skull base approaches and minimizing potential complications.

Duke Scholars

Author Linda Gray Leithe Radiology, Neuroradiology

Author Allan Howard Friedman Neurosurgery