Exostosis of the external auditory canal (also known as surfer's ear), is a benign bony overgrowth of the bony external auditory canal brought about by exposure to cold wind and water combined.
- broad-based or more focal circumferential bony overgrowth of the osseous external auditory canal
- external auditory canal osteoma: unilateral focal, pedunculated bony overgrowth
- external auditory canal cholesteatoma: typically unilateral bony flakes with scalloping of the adjacent bone
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