微小血管減圧術後，遅発性に聴力障害を呈した片側顔面痙攣の2例

Delayed Hearing Loss after Microvascular Decompression for Hemifacial Spasm：Report of Two Cases

Ⅰ．は じ め に

　片側顔面痙攣，三叉神経痛に対する微小血管減圧術の合併症として，難聴が挙げられる^1,2,5-7)．通常，難聴は術直後に明らかとなる．6カ月以内に回復する例もある⁹⁾が，回復せず予後不良となる例も多いといわれており，注意を払うべき合併症の1つである．今回われわれは術後特に問題なく経過したが，1週間後，突然難聴が出現し，保存的治療にて2カ月後速やかに回復を示した片側顔面痙攣の2手術例を経験した．微小血管減圧術の合併症として，術後遅発性に難聴を発症した例は稀と思われ，若干の文献的考察を加え報告する．

　We report two unusual cases of delayed hearing loss after microvascular decompression (MVD) for hemifacial spasm. In the first case,A 59-year-old female noted left hearing loss one week after receiving MVD for left hemifacial spasm. In the second case,A 39-year-old male also noticed ipsilateral hearing loss on the 7th day after MVD for right hemifacial spasm. Both cases were treated by steroid. Two months after the onset,their hearing function improved dramatically. These cases indicated that the delayed hearing loss after MVD for hemifacial spasm can occur,even when gentle microsurgical technique is used,but the prognosis for this condition is fairly good.