종류: 다발근육염(PM), 피부근육염(DM), 봉입체근육염(IBM) 등
임상양상
근위부>원위부, 대칭성/진행성 근력저하
“몸일으키기, 계단오르기, 머리빗기 등”
피부근육염: 특징적 피부소견
Heliotrope rash (eyelid erythematous discoloration + periorbital edema)
Gottron’s sign (erythematous rash over extensor suface of joints)
V sign (rash on sun-exposed ant. neck and chest)