著者

神田 智子 高橋 晴雄 長谷部 誠司 船曳 和雄

出版者

The Society of Practical Otolaryngology

雑誌

耳鼻咽喉科臨床 (ISSN:00326313)

巻号頁・発行日

vol.92, no.3, pp.239-243, 1999-03-01

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A case with a primary mastoid cholesterol cyst accompanying massive bone destruction is reported. The patient was a 43-year-old male, who visited our clinic because of vertigo. Otoneurological examination revealed the patient' s hearing and vestibular function to be nearly normal. A temporal bone CT showed a soft tissue mass in the left mastoid with large bone defects in the posterior and middle cranial fossae, and fistulas in all of the semicircular canals. MRI revealed a huge mass in the mastoid cavity apparently compressing the temporal lobe of the brain. The patient refused surgical treatment, and during the subsequent 4 year follow-up period the mass developed further and a cholesterol cyst was suspected based on the results of another MRI. Surgery revealed a huge cholesterol cyst located in the mastoid cavity with large bone defects and an exposed dura. Histological examination showed cholesterol granuloma accompanied by inflammation and bleeding and surrounded by thick scar tissue.<br>Obstructive and persistent inflammation in the mastoid was considered to be related to development of the mastoid cholesterol cyst.

著者

梅田 裕生 船曳 和雄 高橋 晴雄 長谷部 誠司

出版者

The Society of Practical Otolaryngology

雑誌

耳鼻咽喉科臨床 (ISSN:00326313)

巻号頁・発行日

vol.92, no.1, pp.27-30, 1999-01-01

被引用文献数

4 5

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A case with post-traumatic cholesteatoma of the external auditory meatus extending into the mastoid is reported. A 27-year-old male visited our clinic with complaints of left otorrhea and hearing impairment lasting six months. He had suffered ahead injury three years previously. The left external auditory meatus was filled with otorrhea and debris, and an audiogram revealed slight conductive hearing loss. Computed tomography revealed a fracture line on the bony external auditory meatus and bone resorption at the medial part of the fracture near the eardrum. A soft tissue density mass was observed from the site of bone resorption to the mastoid antrum. During surgery, we found a temporal bone fracture filled with scar tissue, to which the external auditory meatus adhered. At the posterior part of the external auditory meatus medial to the fracture, the epithelium of the external auditory meatus had intruded into the antrum to form a cholesteatoma, which had extended into the whole mastoid cavity. Constriction of scar tissue at the fracture site during healing and a loss of ventilation at the mastoid were suggested to be involved in the pathogenesis of this cholesteatoma.