咀嚼筋筋強直の1例

Idiopathic Masticatory Myotonia:Report of a Case

　はじめに

　咬筋の腫大をきたす状態には，いわゆる咬筋肥大，増殖性筋炎等が知られている。しかしそれらの疾患では開口障害を合併することは少ないとされている。今回われわれは，治療に苦慮した，咬筋を含む咀嚼筋の肥大と著しい開口障害を合併した症例を経験したので報告する。

A 22-year-old male presented cheek pain and trismus which were thought to be a kind of myotonic symptoms. These symptoms started at the age of 12 years old and continued until he was admitted to our hospital. He underwent a partial resection of cheek and parotid area 5 times previously;3 times in the left side and 2 times in the right side. He embarrassed us in poor response to operations and other treatment;right masseter muscle resection and administrations of antibiotics, anti-inflammatory drugs, corticoste-roids, immunosupressive drugs, anticonvulsants. But procainamide, an anti-arrhythmic drug, was only effective to his myotonic symptoms.