患者男性,69岁。左侧臀部肿物40年,无任何不适,近期生长快,手术切除送检,临床诊断:脂肪瘤。病理检查巨检:带皮肿物,大小为4 cm×2.5 cm×2cm,皮肤薄,皮面平滑,切面实性细腻,灰白色、质地脆,无边界。镜检:肿瘤位于表皮下,侵及皮下组织,组织结构复杂多样,形成片块状的基底样细胞以及腺管样、巢团状结构(图1-3),巢团之间为宽窄不一的纤维间隔,瘤细胞界限不清,胞 Male patient, 69 years old. Left hip mass for 40 years, without any discomfort, recent rapid growth, surgical resection submission, clinical diagnosis: lipoma. Histopathological examination: skinned tumor, the size of 4 cm × 2.5 cm × 2cm, thin skin, smooth leather, sliced ​​solid and delicate, gray, crisp texture, no boundaries. Microscopic examination: The tumor is located under the epidermis, invasion and subcutaneous tissue, complex and diverse organizational structure, the formation of lumpy basal-like cells and duct-like, nest-like structure (Figure 1-3) The fibrous septa, unclear tumor cells, cells