以脂膜炎为皮肤表现的皮肌炎九例研究

目的 探讨以脂膜炎为皮肤表现的皮肌炎的临床、病理特点.方法 收集2012年10月至2016年7月复旦大学附属中山医院皮肤科诊治的9例以脂膜炎为皮肤表现的皮肌炎患者的资料,分析其临床与病理特征.结果 9例中女6例,男3例,年龄28～73岁.9例患者脂膜炎皮损均表现为触痛性斑块或结节,分别发生在臀、股、腰、背、腹、上肢和腮部,先于、晚于或与皮肌炎特征性皮损和肌肉损害同时发生,其中1例脂膜炎先于皮肌炎特征性皮损30年发生.皮损组织病理示基底细胞液化变性,真皮血管周围及脂肪小叶和间隔内以淋巴细胞、浆细胞为主的炎性浸润,可有脂肪细胞坏死、钙化和膜囊性改变,血管壁纤维素样坏死和管腔闭塞.脂膜炎先于皮肌炎特征性皮损发生的2例患者曾被数次误诊为狼疮性脂膜炎和深部硬斑病.多数患者对联用糖皮质激素和免疫抑制剂的治疗反应良好,但伴脂肪膜性坏死者,对治疗反应差.结论 皮肌炎的脂膜炎表现具有一定组织学特征,与皮肌炎典型皮损的发生可不同步,在皮肌炎典型损害前出现易被误诊,持续跟踪随访对确诊具有重要意义.

Clinicopathological analysis of nine cases of dermatomyositis with panniculitis as a skin manifestation

Objective To analyze clinical and pathological features of dermatomyositis with panniculitis as a skin manifestation.Methods Clinical data were collected from 9 cases of dermatomyositis with panniculitis as a skin manifestation in Department of Dermatology of Zhongshan Hospital affiliated to Fudan University from October 2012 to July 2016,and their clinical and pathological features were analyzed.Results Of the 9 cases,6 were female and 3 were male,and the age ranged from 28 to 73 years.Panniculitis lesions of the 9 patients all manifested as painful indurated plaques or nodules on the buttock,thigh,waist,back,abdomen,upper extremities and cheeks.These lesions occurred before,after or simultaneously with the onset of characteristic skin and muscle lesions of dermatomyositis,especially preceded the onset of characteristic lesions of dermatomyositis by 30 years in 1 case.Histopathological examination of lesions showed liquefaction degeneration of basal cells,inflammatory infiltration of lymphocytes and plasma cells around blood vessels,in the fat lobules as well as between the lobules and septa in the dermis.The necrosis and calcification of lipocytes,lipomembranous changes,fibrinoid necrosis of damaged vessel walls and microvascular occlusion were observed in some cases.Because panniculitis preceded the onset of characteristic lesions of dermatomyositis,2 patients were misdiagnosed with lupus panniculitis and morphea profunda for several times.Most patients had good response to systemic glucocorticoids combined with immunosuppressive agents,while the patients with lipomembranous fat necrosis had poor response to the combination therapy.Conclusions Panniculitis lesions of dermatomyositis are histologically characteristic,and may do not coincide with the onset of characteristic lesions of dermatomyositis.If panniculitis lesions precede characteristic lesions of dermatomyositis,patients will be easily misdiagnosed.Thus,persistent follow-up visit will be of great importance for the diagnosis.