AJNR -- Roll et al. 24 (4): 762 Figure 4

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FIG 4. Carotid canals and inferior tympanic canals.

A, Case 1. CT scan shows bilateral hypoplastic carotid canals (horizontal arrows) and enlarged bilateral inferior tympanic canals (vertical arrows) through which the aberrant ICA (inferior tympanic artery portion) passes.

B, Case 2. CT scan shows a normal right carotid canal (horizontal arrow on the patient’s right), a hypoplastic carotid canal (horizontal arrow on the patient’s left), and the inferior tympanic canal (vertical arrow) with the aberrant ICA.