Purpose To investigate the clinicopathological features, the diagnosis and differential diagnosis of spindle cell lipoma/pleomorphic lipoma (SCL/PL). Methods Eight cases of SCL/PL were studied by HE staining and immunohistochemistry. The literature was reviewed. Results Microscopically, the neoplasm consisted of spindle cells, mature adipocytes and thick rope-like collagen bundles in variable proportions with mucinous degeneration. The floret-like multinucleated giant cells were easy to be seen in the pleomorphic lipoma. Immunohistochemical analysis revealed that the tumor cells were positive for CD34 and vimentin. The Ki-67 was approximately 2％. The patients were followed up for 3 ～ 74 months, and no recurrence or metastasis occurred. Conclusion The SCL/PL is a special subtype of benign lipoma, surgery is considered the first choice, and outcome is favorable. The diagnosis and differential diagnosis of SCL/PL are important.%目的 探讨梭形细胞脂肪瘤/多形性脂肪瘤(spindle cell lipoma/plemorphic lipoma,SCL/PL)的临床病理特征、诊断及鉴别诊断.方法 结合HE和免疫组化染色对8例SCL/PL进行回顾性分析,并复习相关文献.结果 镜下主要由增生的梭形细胞、成熟脂肪细胞和多少不等的绳索样胶原纤维组成,间质黏液变性,PL还可见特征性的大花环状的多核巨细胞.肿瘤细胞表达vimentin和CD34,Ki-67增殖指数约2％.术后随访3～74个月,均未见复发或转移.结论 SCL/PL是一种良性脂肪瘤的特殊亚型,治疗首选手术切除,预后良好,因此其诊断及鉴别诊断尤为重要.
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