Chronic Orbital Myositisの1例

A Case of Chronic Orbital Myositis

I．緒言

　Chronic orbital myositisの眼窩炎性偽腫瘍における頻度は，相当高頻度を占めるといわれているが，外眼筋の状態や，さらにその原因に関しては不明の点が多い。本症は，病理組織学的にはリンパ球浸潤，線維症，筋線維変性を特徴としている。

　Francoisらによると，orbital myositisは3型に分類されている。

A report is presented of a 37-year-old male with bilateral exophthalmus of 3 years' duration, ptosis, external ophthalmoplegia and recurrent ocular pain.

EMG studies of the paralyzed ocular revealed myogenic patterns with entirely absent neuro-pathic discharges, while histopathological find-ings of biopsied muscle specimen showed the pre-sence of inflammatory changes of the musclefiber and the interstitial tissue. Systemic studies also showed positive findings indicative of in-fectious condition of unidentifiable etiology.Some of the positive findings, as BSR and CRP ones, promptly improved following systemic steroid therapy.