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A Normal Variant

Shu-Ren Lin, MD; K. Francis Lee, MD; George N. Stein, MD; Inkyu Lee, MD

Arch Otolaryngol. 1973;98(3):164-169.

Abstract
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.

Author Affiliations
Philadelphia

From the Department of Radiology, Presbyterian-University of Pennsylvania Medical Center, Philadelphia (Drs. Lin, Stein, and I. Lee) and the Department of Radiology, Thomas Jefferson University Hospital, Philadelphia (Dr. K. F. Lee).

Footnotes
Accepted for publication Sept 14, 1972.

Reprint requests to Department of Radiology, Graduate Hospital, University of Pennsylvania, 19th and Lombard streets, Philadelphia, PA 19146 (Dr. Lin).

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