Five cases of significant asymmetry of the internal auditory canals as a normal variant are reported; these were proven normal by iophendylate injection tomographic study. The incidence of significant asymmetry of the canals between the two sides is 2% in our series. Even when significant asymmetry in size and configuration of the internal auditory canals is present, a conclusive diagnosis cannot by made without the benefit of iophendylate injection cisternography. The technique of cisternography using a small amount of iophendylate injection (1 to 3 ml) combined with polytomography is described briefly.
Lin S, Lee KF, Stein GN, Lee I. Asymmetrical Internal Auditory Canals: A Normal Variant. Arch Otolaryngol. 1973;98(3):164–169. doi:10.1001/archotol.1973.00780020172006
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