目的：研究毛母细胞瘤（TB）的病理形态特征、诊断及鉴别诊断。方法回顾性分析3例 TB 临床病理特点、形态学及免疫表型特征，以及与多种疾病的鉴别诊断；另选择5例基底细胞癌行免疫表型检测并重点与 TB 相鉴别诊断。结果镜下可见，3例中肿瘤均位于皮下，不与表皮相连，单一的基底样细胞构成肿瘤主体，肿瘤周边细胞呈栅栏状排列。例1可见大小不等的囊腔及色素沉积，诊断为色素性 TB；例2可见原始毛乳头样结构，诊断为 TB；例3肿瘤中的基底样细胞核呈栅栏状排列，形成波纹状结构，诊断为波纹状 TB。3例雄激素受体（AR）及2例 B 淋巴细胞2（Bcl-2）阴性表达，1例细胞角蛋白（CK）20散在阳性，3例 CD10间质及毛乳头样结构阳性；5例基底细胞癌周边栅栏状排列的肿瘤细胞 CD10阳性，4例 AR 阳性，3例 Bcl-2阳性，5例CK20阴性。结论 TB 是来源于毛囊生发上皮的良性肿瘤，完整切除预后良好，需重点与基底细胞癌相鉴别。%Objective To summarize and study the clinicopathologic features,diagnosis and differential diagnosis of tricho-blastoma (TB).Methods The clinicopathological characteristics,histomorphology features and immunophenotype features of TB and differential diagnosis with multiple diseases in 3 cases of TB were retrospectively analyzed;moreover,5 cases of basal cell carci-noma were selected and performed the immunophenotype detection,which focused on the differential diagnosis with TB.Results The masses in 3 cases were located under the skin without connecting with the epidermis and were composed of basal-like cells with palisade arrangement of peripheral cells.The case 1 showed unequal-sized multiple cyst cavities and pigment deposition and was di-agnosed as pigmented TB.The papillary mesenchymal bodies were found in case 2,which was diagnosed as TB.The basal cells of tumor in case 3 distributed as palisade arrangement and formed the wave structure,which was diagnosed as rippled-pattern TB.AR in 3 cases and Bcl-2 in 2 cases were negative expression,CK20 in 1 case was sporadically positive,CD10 stroma and papillary struc-ture in 3 cases were positive,paliform-like arrange tumor cells CD10 around basal cell carcinomas in 5 cases were positive,AR in 4 cases was positive,Bcl-2 in 3 cases was positive and CK20 in 5 cases was negative.Conclusion TB is a benign tumor derived from the hair follicle germinal epithelium with a good prognosis after complete resection and the differential diagnosis focuses on basal cell carcinomas.
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