皮肤Rosai-Dorfman病

目的探讨皮肤Rosai-Dorfman病(CRDD)的临床病理学特征、免疫学表型和鉴别诊断。方法分析8例CRDD患者的临床表现,对标本进行病理学和免疫组织化学(EnVision二步法,抗体包括S-100蛋白、CD68、CD1a、CD45、CD20、CD79a、CD3和CD45RO)染色观察。结果8例患者临床皮损均为四肢或躯干多个丘疹、结节和(或)融合斑块,无淋巴结肿大等其他系统性病变。镜下特点为真皮和(或)皮下脂肪组织内数量不一的S-100蛋白阳性窦组织细胞伴大量淋巴细胞和浆细胞浸润。10％～50％组织细胞胞质内见淋巴细胞伸入。病程较长者病灶内见席纹样排列硬化性纤维间质,夹杂个别微脓疡形成。2例脉管间隙内可见窦组织细胞。结论CRDD是一种良性组织细胞持续增生性病变,与巨淋巴结病性窦组织细胞增生症不同,系统累及可能极小,预后较好。组织学上应避免与其他类型组织细胞增生症、真皮隆突性纤维肉瘤、黄色瘤及皮肤淋巴组织增生性病变等混淆。免疫组织化学S-100蛋白、CD68等标记对鉴别诊断有帮助。

Cutaneous Rosai-Dorfman disease

Objective To investigate the clinicopathologic feature, immunophenotype and differential diagnosis of cutaneous Rosai-Dorfman disease (CRDD). Methods Clinical manifestation, morphologic features and immunohistochemical staining were studied in 8 cases of CRDD. Results All 8 patients presented with multiple papules, nodules and/or coalescent patches or plaques distributing over the extremities or trunk, without lymphadenopathy or other systemic abnormalities. Microscopically, the lesions were located intradermally and/or subcutaneously. CRDD was characterized by the presence of S-100 positive histiocytic cells exhibiting emperipolesis, accompanying with infiltration of mixed inflammatory cells. Fibrosis, somewhere in vague storiform pattern due to stromal responses, with distribution of individual neutrophil microabscess was seen in cases with a long course of illness. Dilated vascular spaces in dermis containing numerous large typical histiocytes were seen in 2 cases. Conclusions CRDD is a benign, persistent proliferative disease of histiocytes. Systemic involvement is rare, outcome favorable. It should be differentiated from other types of histiocytosis, dermatofibrosarcoma protuberans, xanthoma and lymphoproliferative disorders. Immunohistochemical staining for S-100 protein and CD68 is helpful in making a correct diagnosis.