Purpose To study the clinicopathologic features,immunophenotypes,diagnosis and differential diagnosis of epithelioid hemangioendothelioma (EHE).Methods Histopathology,clinical features and immunophenotypes of 12 cases of EHE which diagnosed by resection and core needle biopsy were analyzed retrospectively.These patients were followed-up.Results There were 9 males and 3 females,aged from 30 to 69 years,with an average age of 43.5 years.Among 12 EHEs,there were 8 cases in liver,3 cases in bone,and 1 case in lung.Histopathologically,the tumor cells were round and oval epithelioid arranged in single,nests,and cords.Tumor cells had abundant eosinophilic cytoplasm that contained vacuoles and erythrocyte in the tumor cytoplasm.The stroma showed myxoid change.Sparse calcification could be seen in some EHEs.Immunophenotype,tumor cells showed strong positive for CD34,CD31 and factor Ⅷ related antigen (FⅧRAg).Most EHEs are alive with tumor.1 case recurred in 6 months after surgery.1 patient died at 100 months postoperation.3 cases were lost follow-up.Conclusion EHE is a very rare low-grade malignant vascular neoplasm especially for arising from solid organ.Precise diagnosis must depend on surgical histopathology and molecular biology test of WWTR1-CAMTA1 fusion gene.%目的 探讨实质脏器上皮样血管内皮瘤(epihelioid hemangioendothelioma,EHE)的临床病理学特征、免疫表型、诊断及鉴别诊断.方法 回顾性分析12例手术切除及粗针穿刺活检诊断为EHE的临床病理学特征及免疫表型,并进行随访.结果 男性9例,女性3例,患者年龄30 ～ 69岁,平均43.5岁.其中肝脏8例,骨组织3例,肺组织1例.镜检:圆形及卵圆形上皮样细胞为散在单个、巢团状、条索状排列,瘤细胞胞质嗜酸性,可见细胞质内空泡及散在红细胞,间质黏液样变性,有些病例可见散在少数钙化.免疫表型:CD34、CD31、FⅧRAg均呈阳性,多数病例均带瘤存活,1例患者术后半年复发,1例患者随访100个月后死亡,3例患者失访.结论 EHE属于少见的血管源性低度恶性肿瘤,尤其发生于实质脏器者,临床及影像学特征无特异性,确诊需结合组织病理学、免疫表型或分子生物学检查WWTR1-CAMTA1融合基因.
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