Exostosis(骨軟骨腫)On the left bilateral bony lesions of the external auditory canal, typical of exostoses.
Exostoses of the external auditory canal are usually multiple, sessile, and bilateral and can cause severe narrowing of the external auditory canal.
Exostoses are caused by contact with cold water and mostly seen in swimmers and surfers.
Osteomas are less common and mostly unilateral and pedunculated.
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