外耳道Choristomaの稀な一例 : 臨床経過と光顕的•走査電顕的観察成績

概要

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A rare case of choristoma in the external auditory canal is reported. The patient was a 23-year-old woman who complained of hearing impairment and fullness of the left ear of approximately 3 years duration. She had both Peutz-Jeghers syndrome and Cushings syndrome. On otoscopical examination a tumorous mass was found arising from the posterior wall of the external auditory canal. It was extirpated easily by endaural approach under local anesthesia with modified neuroleptanalgesia. The tumor was not connected directly with the bony tissueof the bony external auditory canal. It was 10×6×5mm in size and 1.2gm in weight. Histopathological diagnosis was made of choristoma, which resembled to osteoma. Scanning electron microscopic examination of the fractured surface revealed that there were many fibrovascular channels surrounded by lammelated bony layers. Energy dispersive X-ray microanalysis proved that this tumor mainly contained chemical elements such as calcium and phosphorus, but not sulfur and other elements. From the basis of ultrastructural characteristics and chemical compositions the genesis of choristoma was briefly discussed.
社団法人日本耳鼻咽喉科学会の論文